EP4008725A1 - Compositions and methods of chimeric autoantibody receptor t cells - Google Patents
Compositions and methods of chimeric autoantibody receptor t cells Download PDFInfo
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- EP4008725A1 EP4008725A1 EP21196321.0A EP21196321A EP4008725A1 EP 4008725 A1 EP4008725 A1 EP 4008725A1 EP 21196321 A EP21196321 A EP 21196321A EP 4008725 A1 EP4008725 A1 EP 4008725A1
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Definitions
- Autoimmunity is the third most common category of disease in the United States, affecting 8% of the population.
- autoimmune diseases those predominantly caused by T cells, and those predominantly caused by B cells and the autoantibodies they produce.
- Pemphigus vulgaris PV
- Dsg3 skin cell adhesion protein desmoglein 3
- compositions of and methods for their use, of a chimeric autoantibody receptor (CAAR) specific for an autoantibody As described below, the present invention includes compositions of and methods for their use, of a chimeric autoantibody receptor (CAAR) specific for an autoantibody.
- CAAR chimeric autoantibody receptor
- One aspect of the invention includes an isolated nucleic acid sequence encoding a chimeric autoantibody receptor (CAAR), wherein the isolated nucleic acid sequence comprises a nucleic acid sequence of an autoantigen or fragment thereof, a nucleic acid sequence of a transmembrane domain, a nucleic acid sequence of an intracellular domain of a costimulatory molecule, and a nucleic acid sequence of a signaling domain.
- CAAR chimeric autoantibody receptor
- the invention includes a vector comprising the isolated nucleic acid sequence described herein.
- the invention includes an isolated chimeric autoantibody receptor (CAAR) comprising an extracellular domain comprising an autoantigen or fragment thereof, a transmembrane domain, and an intracellular signaling domain.
- CAAR chimeric autoantibody receptor
- the invention includes a genetically modified cell comprising the CAAR described herein.
- the autoantigen is selected from the group consisting of Dsgl, Dsg3, and a fragment thereof.
- the autoantigen comprises Dsg3 comprising an amino acid sequence selected from the group consisting of SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:11, SEQ ID NO:12, and SEQ ID NO:36.
- the autoantigen comprises Dsg3 and the isolated nucleic acid sequence further comprises a nucleic acid sequence encoding a propeptide of Dsg3.
- the Dsg3 propeptide it comprises an amino acid sequence of SEQ ID NO:2.
- the isolated nucleic acid sequence further comprises a nucleic acid sequence of a CD8 alpha chain signal peptide.
- a CD8 alpha chain signal peptide In some embodiments that include the CD8 alpha chain signal peptide, it comprises an amino acid sequence of SEQ ID NO:1.
- the nucleic acid sequence of the transmembrane domain encodes a CD8 alpha chain hinge and transmembrane domain.
- the transmembrane domain comprises an amino acid sequence of SEQ ID NO:13.
- the isolated nucleic acid sequence further comprises a nucleic acid sequence of a peptide linker.
- a nucleic acid sequence of a peptide linker In some embodiments that include the peptide linker, it comprises an amino acid sequence of SEQ ID NO:14.
- the nucleic acid sequence of the intracellular signaling domain comprises a nucleic acid sequence encoding a CD137 intracellular domain.
- the intracellular signaling domain comprises an amino acid sequence of SEQ ID NO:15.
- the nucleic acid sequence of the intracellular signaling domain comprises a nucleic acid sequence encoding a CD3 zeta signaling domain.
- the intracellular signaling domain comprises an amino acid sequence of SEQ ID NO:16.
- the cell comprising the CAAR expresses it and has high affinity to autoantibodies expressed on B cells.
- the cell expresses the CAAR and induces killing of B cells expressing autoantibodies.
- the cell expresses the CAAR and has low affinity to antibodies bound to a Fc receptor.
- the cell expresses the CAAR and has limited toxicity toward healthy cells.
- the cell is selected from the group consisting of a helper T cell, a cytotoxic T cell, a memory T cell, regulatory T cell, gamma delta T cell, natural killer (NK) cell, cytokine induced killer cell, a cell line thereof, and other effector cell.
- the invention includes a method for treating an autoimmune disease in a subject, the method comprising: administering to the subject an effective amount of a genetically modified T cell comprising an isolated nucleic acid sequence encoding a chimeric autoantibody receptor (CAAR), wherein the isolated nucleic acid sequence comprises an extracellular domain comprising an autoantigen or fragment thereof, a nucleic acid sequence of a transmembrane domain, and a nucleic acid sequence of an intracellular signaling domain, thereby treating the autoimmune disease in the subject.
- the autoimmune disease includes pemphigus vulgaris, paraneoplastic pemphigus, and pemphigus foliaceus.
- the subject is a human.
- the modified T cell targets a B cell.
- the invention includes compositions comprising at least one chimeric autoantibody receptor (CAAR) specific for an autoantibody, vectors comprising the same, compositions comprising CAAR vectors packaged in viral particles, and recombinant T cells comprising the CAAR.
- CAAR chimeric autoantibody receptor
- the invention also includes methods of making a genetically modified T cell expressing a CAAR (CAART) wherein the expressed CAAR comprises a desmoglein extracellular domain.
- the present invention also relates generally to the use of T cells engineered to express a Chimeric AutoAntibody Receptor (CAAR) to treat an autoimmune disease associated with expression of self-antigens.
- CAAR Chimeric AutoAntibody Receptor
- the T cells expressing the CAAR of the invention specifically bind to and kill desmoglein 1 or 3 autoantibody expressing cells, but not normal antibody expressing cells.
- an element means one element or more than one element.
- antibody refers to an immunoglobulin molecule binds with an antigen.
- Antibodies can be intact immunoglobulins derived from natural sources or from recombinant sources and can be immunoreactive portions of intact immunoglobulins. Antibodies are typically tetramers of immunoglobulin molecules.
- the antibody in the present invention may exist in a variety of forms where the antibody is expressed as part of a contiguous polypeptide chain including, for example, a single domain antibody fragment (sdAb), a single chain antibody (scFv) and a humanized antibody ( Harlow et al., 1999, In: Using Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press, NY ; Harlow et al., 1989, In: Antibodies: A Laboratory Manual, Cold Spring Harbor, New York ; Houston et al., 1988, Proc. Natl. Acad. Sci. USA 85:5879-5883 ; Bird et al., 1988, Science 242:423-426 ).
- sdAb single domain antibody fragment
- scFv single chain antibody
- humanized antibody Harlow et al., 1999, In: Using Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press, NY ; Harlow et al., 1989, In: Antibodies: A Laboratory Manual, Cold Spring Harbor,
- high affinity refers to high specificity in binding or interacting or attraction of one molecule to a target molecule.
- antigen or "Ag” as used herein is defined as a molecule that provokes an immune response. This immune response may involve either antibody production, or the activation of specific immunologically-competent cells, or both.
- antigens can be derived from recombinant or genomic DNA. A skilled artisan will understand that any DNA, which comprises a nucleotide sequences or a partial nucleotide sequence encoding a protein that elicits an immune response therefore encodes an "antigen" as that term is used herein.
- an antigen need not be encoded solely by a full length nucleotide sequence of a gene. It is readily apparent that the present invention includes, but is not limited to, the use of partial nucleotide sequences of more than one gene and that these nucleotide sequences are arranged in various combinations to encode polypeptides that elicit the desired immune response. Moreover, a skilled artisan will understand that an antigen need not be encoded by a "gene" at all. It is readily apparent that an antigen can be generated synthesized or can be derived from a biological sample. Such a biological sample can include, but is not limited to a tissue sample, a tumor sample, a cell or a biological fluid.
- autoantigen is meant an endogenous antigen that stimulates production of an autoimmune response, such as production of autoantibodies.
- Autoantigen also includes a self-antigen or antigen from a normal tissue that is the target of a cell-mediated or an antibody-mediated immune response that may result in the development of an autoimmune disease.
- autoantigens include, but are not limited to, desmoglein 1, desmoglein 3, and fragments thereof.
- limited toxicity refers to the peptides, polynucleotides, cells and/or antibodies of the invention manifesting a lack of substantially negative biological effects, anti-tumor effects, or substantially negative physiological symptoms toward a healthy cell, non-tumor cell, non-diseased cell, non-target cell or population of such cells either in vitro or in vivo.
- Autoantibody refers to an antibody that is produced by a B cell specific for an autoantigen.
- autoimmune disease as used herein is defined as a disorder or condition that results from an antibody mediated autoimmune response against autoantigens.
- An autoimmune disease results in the production of autoantibodies that are inappropriately produced and/or excessively produced to a self-antigen or autoantigen.
- autologous is meant to refer to any material derived from the same individual to which it is later to be re-introduced into the individual.
- Allogeneic refers to a graft derived from a different animal of the same species.
- Xenogeneic refers to a graft derived from an animal of a different species.
- CAAR Chimeric autoantibody receptor
- the CAAR includes an antigen or fragment thereof that is specific for a pathogenic autoantibody.
- the CAAR also includes a transmembrane domain, an intracellular domain and a signaling domain.
- conservative sequence modifications is intended to refer to amino acid modifications that do not significantly affect or alter the binding characteristics of the antibody containing the amino acid sequence. Such conservative modifications include amino acid substitutions, additions and deletions. Modifications can be introduced into an antibody of the invention by standard techniques known in the art, such as site-directed mutagenesis and PCR-mediated mutagenesis. Conservative amino acid substitutions are ones in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art.
- amino acids with basic side chains e.g., lysine, arginine, histidine
- acidic side chains e.g., aspartic acid, glutamic acid
- uncharged polar side chains e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine, tryptophan
- nonpolar side chains e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine
- beta-branched side chains e.g., threonine, valine, isoleucine
- aromatic side chains e.g., tyrosine, phenylalanine, tryptophan, histidine
- one or more amino acid residues within the extracellular regions of the CAAR of the invention can be replaced with other amino acid residues having a similar side chain or charge and the altered CAAR can be tested for the ability to bind autoantibodies using the functional assays described herein.
- Co-stimulatory ligand includes a molecule on an antigen presenting cell (e.g., an aAPC, dendritic cell, B cell, and the like) that specifically binds a cognate co-stimulatory molecule on a T cell, thereby providing a signal which, in addition to the primary signal provided by, for instance, binding of a TCR/CD3 complex with an MHC molecule loaded with peptide, mediates a T cell response, including, but not limited to, proliferation, activation, differentiation, and the like.
- an antigen presenting cell e.g., an aAPC, dendritic cell, B cell, and the like
- a "co-stimulatory molecule” refers to the cognate binding partner on a T cell that specifically binds with a co-stimulatory ligand, thereby mediating a co-stimulatory response by the T cell, such as, but not limited to, proliferation.
- Co-stimulatory molecules include, but are not limited to an MHC class I molecule, BTLA and a Toll ligand receptor.
- Dsmoglein 1 refers to a calcium binding transmembrane glycoprotein that is a component of desmosomes found in cell-cell junctions between epithelial cells.
- An exemplary Dsg1 sequence includes human Dsg1 found at GenBank Accession No. NM_001942 and NP_001932, or a fragment thereof, and the mouse Dsg1 sequence found at NM_010079 or NP_034209, or a fragment thereof.
- Dsg3 refers to a calcium binding transmembrane glycoprotein that is a component of desmosomes found in cell-cell junctions between epithelial cells.
- An exemplary Dsg3 sequence includes human Dsg3 found at GenBank Accession No. NM_001944 and NP_001935 (P32926), or a fragment thereof, and the mouse Dsg3 sequence found at NM_030596 or NP_085099, or a fragment thereof.
- Encoding refers to the inherent property of specific sequences of nucleotides in a polynucleotide, such as a gene, a cDNA, or an mRNA, to serve as templates for synthesis of other polymers and macromolecules in biological processes having either a defined sequence of nucleotides (i.e., rRNA, tRNA and mRNA) or a defined sequence of amino acids and the biological properties resulting therefrom.
- a gene encodes a protein if transcription and translation of mRNA corresponding to that gene produces the protein in a cell or other biological system.
- Both the coding strand the nucleotide sequence of which is identical to the mRNA sequence and is usually provided in sequence listings, and the non-coding strand, used as the template for transcription of a gene or cDNA, can be referred to as encoding the protein or other product of that gene or cDNA.
- nucleotide sequence encoding an amino acid sequence includes all nucleotide sequences that are degenerate versions of each other and that encode the same amino acid sequence. Nucleotide sequences that encode proteins and RNA may include introns.
- Effective amount or “therapeutically effective amount” are used interchangeably herein, and refer to an amount of a compound, formulation, material, or composition, as described herein effective to achieve a particular biological result. Such results may include, but are not limited to, the inhibition of virus infection as determined by any means suitable in the art.
- endogenous refers to any material from or produced inside an organism, cell, tissue or system.
- exogenous refers to any material introduced from or produced outside an organism, cell, tissue or system.
- expression is defined as the transcription and/or translation of a particular nucleotide sequence driven by a promoter.
- “Expression vector” refers to a vector comprising a recombinant polynucleotide comprising expression control sequences operatively linked to a nucleotide sequence to be expressed.
- An expression vector comprises sufficient cis-acting elements for expression; other elements for expression can be supplied by the host cell or in an in vitro expression system.
- Expression vectors include all those known in the art, such as cosmids, plasmids ( e.g ., naked or contained in liposomes), retrotransposons ( e.g. piggyback, sleeping beauty), and viruses ( e.g., lentiviruses, retroviruses, adenoviruses, and adeno-associated viruses) that incorporate the recombinant polynucleotide.
- homologous refers to the subunit sequence identity between two polymeric molecules, e.g ., between two nucleic acid molecules, such as, two DNA molecules or two RNA molecules, or between two polypeptide molecules. When a subunit position in both of the two molecules is occupied by the same monomeric subunit; e.g. , if a position in each of two DNA molecules is occupied by adenine, then they are homologous at that position.
- the homology between two sequences is a direct function of the number of matching or homologous positions; e.g., if half (e.g., five positions in a polymer ten subunits in length) of the positions in two sequences are homologous, the two sequences are 50% homologous; if 90% of the positions ( e.g., 9 of 10), are matched or homologous, the two sequences are 90% homologous.
- Identity refers to the subunit sequence identity between two polymeric molecules particularly between two amino acid molecules, such as, between two polypeptide molecules. When two amino acid sequences have the same residues at the same positions; e.g., if a position in each of two polypeptide molecules is occupied by an Arginine, then they are identical at that position. The identity or extent to which two amino acid sequences have the same residues at the same positions in an alignment is often expressed as a percentage.
- the identity between two amino acid sequences is a direct function of the number of matching or identical positions; e.g., if half (e.g., five positions in a polymer ten amino acids in length) of the positions in two sequences are identical, the two sequences are 50% identical; if 90% of the positions ( e.g., 9 of 10), are matched or identical, the two amino acids sequences are 90% identical.
- an "instructional material” includes a publication, a recording, a diagram, or any other medium of expression which can be used to communicate the usefulness of the compositions and methods of the invention.
- the instructional material of the kit of the invention may, for example, be affixed to a container which contains the nucleic acid, peptide, and/or composition of the invention or be shipped together with a container which contains the nucleic acid, peptide, and/or composition.
- the instructional material may be shipped separately from the container with the intention that the instructional material and the compound be used cooperatively by the recipient.
- Intracellular domain refers to a portion or region of a molecule that resides inside a cell.
- isolated means altered or removed from the natural state.
- a nucleic acid or a peptide naturally present in a living animal is not “isolated,” but the same nucleic acid or peptide partially or completely separated from the coexisting materials of its natural state is “isolated.”
- An isolated nucleic acid or protein can exist in substantially purified form, or can exist in a non-native environment such as, for example, a host cell.
- A refers to adenosine
- C refers to cytosine
- G refers to guanosine
- T refers to thymidine
- U refers to uridine.
- nucleotide sequence encoding an amino acid sequence includes all nucleotide sequences that are degenerate versions of each other and that encode the same amino acid sequence.
- the phrase nucleotide sequence that encodes a protein or an RNA may also include introns to the extent that the nucleotide sequence encoding the protein may in some version contain an intron(s).
- a "lentivirus” as used herein refers to a genus of the Retroviridae family. Lentiviruses are unique among the retroviruses in being able to infect non-dividing cells; they can deliver a significant amount of genetic information into the DNA of the host cell, so they are one of the most efficient methods of a gene delivery vector. HIV, SIV, and FIV are all examples of lentiviruses. Vectors derived from lentiviruses offer the means to achieve significant levels of gene transfer in vivo.
- operably linked refers to functional linkage between a regulatory sequence and a heterologous nucleic acid sequence resulting in expression of the latter.
- a first nucleic acid sequence is operably linked with a second nucleic acid sequence when the first nucleic acid sequence is placed in a functional relationship with the second nucleic acid sequence.
- a promoter is operably linked to a coding sequence if the promoter affects the transcription or expression of the coding sequence.
- operably linked DNA sequences are contiguous and, where necessary to join two protein coding regions, in the same reading frame.
- parenteral administration of an immunogenic composition includes, e.g., subcutaneous (s.c.), intravenous (i.v.), intramuscular (i.m.), or intrasternal injection, or infusion techniques.
- nucleotide as used herein is defined as a chain of nucleotides.
- nucleic acids are polymers of nucleotides.
- nucleic acids and polynucleotides as used herein are interchangeable.
- nucleic acids are polynucleotides, which can be hydrolyzed into the monomeric “nucleotides.” The monomeric nucleotides can be hydrolyzed into nucleosides.
- polynucleotides include, but are not limited to, all nucleic acid sequences which are obtained by any means available in the art, including, without limitation, recombinant means, i.e., the cloning of nucleic acid sequences from a recombinant library or a cell genome, using ordinary cloning technology and PCR TM , and the like, and by synthetic means.
- recombinant means i.e., the cloning of nucleic acid sequences from a recombinant library or a cell genome, using ordinary cloning technology and PCR TM , and the like, and by synthetic means.
- peptide As used herein, the terms “peptide,” “polypeptide,” and “protein” are used interchangeably, and refer to a compound comprised of amino acid residues covalently linked by peptide bonds.
- a protein or peptide must contain at least two amino acids, and no limitation is placed on the maximum number of amino acids that can comprise a protein's or peptide's sequence.
- Polypeptides include any peptide or protein comprising two or more amino acids joined to each other by peptide bonds.
- the term refers to both short chains, which also commonly are referred to in the art as peptides, oligopeptides and oligomers, for example, and to longer chains, which generally are referred to in the art as proteins, of which there are many types.
- Polypeptides include, for example, biologically active fragments, substantially homologous polypeptides, oligopeptides, homodimers, heterodimers, variants of polypeptides, modified polypeptides, derivatives, analogs, fusion proteins, among others.
- the polypeptides include natural peptides, recombinant peptides, synthetic peptides, or a combination thereof.
- proinflammatory cytokine refers to a cytokine or factor that promotes inflammation or inflammatory responses.
- proinflammatory cytokines include, but are not limited to, chemokines (CCL, CXCL, CX3CL, XCL), interleukins (such as, IL-1, IL-2, IL-3, IL-5, IL-6, IL-7, IL-9, IL10 and IL-15), interferons (IFN ⁇ ), and tumor necrosis factors (TNF ⁇ and TNF ⁇ ).
- promoter as used herein is defined as a DNA sequence recognized by the synthetic machinery of the cell, or introduced synthetic machinery, required to initiate the specific transcription of a polynucleotide sequence.
- promoter/regulatory sequence means a nucleic acid sequence which is required for expression of a gene product operably linked to the promoter/regulatory sequence.
- this sequence may be the core promoter sequence and in other instances, this sequence may also include an enhancer sequence and other regulatory elements which are required for expression of the gene product.
- the promoter/regulatory sequence may, for example, be one which expresses the gene product in a tissue specific manner.
- a “constitutive" promoter is a nucleotide sequence which, when operably linked with a polynucleotide which encodes or specifies a gene product, causes the gene product to be produced in a cell under most or all physiological conditions of the cell.
- an “inducible" promoter is a nucleotide sequence which, when operably linked with a polynucleotide which encodes or specifies a gene product, causes the gene product to be produced in a cell substantially only when an inducer which corresponds to the promoter is present in the cell.
- tissue-specific promoter is a nucleotide sequence which, when operably linked with a polynucleotide encodes or specified by a gene, causes the gene product to be produced in a cell substantially only if the cell is a cell of the tissue type corresponding to the promoter.
- a “signal transduction pathway” refers to the biochemical relationship between a variety of signal transduction molecules that play a role in the transmission of a signal from one portion of a cell to another portion of a cell.
- the phrase "cell surface receptor” includes molecules and complexes of molecules capable of receiving a signal and transmitting signal across the membrane of a cell.
- Signal domain refers to the portion or region of a molecule that recruits and interacts with specific proteins in response to an activating signal.
- subject is intended to include living organisms in which an immune response can be elicited (e.g., mammals).
- substantially purified cell is a cell that is essentially free of other cell types.
- a substantially purified cell also refers to a cell which has been separated from other cell types with which it is normally associated in its naturally occurring state.
- a population of substantially purified cells refers to a homogenous population of cells. In other instances, this term refers simply to cells that have been separated from the cells with which they are naturally associated in their natural state.
- the cells are cultured in vitro. In other embodiments, the cells are not cultured in vitro.
- terapéutica as used herein means a treatment and/or prophylaxis.
- a therapeutic effect is obtained by suppression, remission, or eradication of a disease state.
- transfected or “transformed” or “transduced” as used herein refers to a process by which exogenous nucleic acid is transferred or introduced into the host cell.
- a “transfected” or “transformed” or “transduced” cell is one which has been transfected, transformed or transduced with exogenous nucleic acid.
- the cell includes the primary subject cell and its progeny.
- Transmembrane domain refers to a portion or a region of a molecule that spans a lipid bilayer membrane.
- under transcriptional control or "operatively linked” as used herein means that the promoter is in the correct location and orientation in relation to a polynucleotide to control the initiation of transcription by RNA polymerase and expression of the polynucleotide.
- a “vector” is a composition of matter which comprises an isolated nucleic acid and which can be used to deliver the isolated nucleic acid to the interior of a cell.
- vectors are known in the art including, but not limited to, linear polynucleotides, polynucleotides associated with ionic or amphiphilic compounds, plasmids, and viruses.
- the term “vector” includes an autonomously replicating plasmid or a virus.
- the term should also be construed to include non-plasmid and non-viral compounds which facilitate transfer of nucleic acid into cells, such as, for example, polylysine compounds, liposomes, and the like.
- viral vectors include, but are not limited to, adenoviral vectors, adeno-associated virus vectors, retroviral vectors, lentiviral vectors, and the like.
- telomere binding partner e.g., a stimulatory and/or costimulatory molecule present on a T cell
- stimulation is meant a primary response induced by binding of a stimulatory molecule (e.g., a TCR/CD3 complex) with its cognate ligand thereby mediating a signal transduction event, such as, but not limited to, signal transduction via the TCR/CD3 complex.
- a stimulatory molecule e.g., a TCR/CD3 complex
- Stimulation can mediate altered expression of certain molecules, such as downregulation of TGF- ⁇ , and/or reorganization of cytoskeletal structures, and the like.
- a "stimulatory molecule,” as the term is used herein, means a molecule on a T cell that specifically binds with a cognate stimulatory ligand present on an antigen presenting cell.
- a “stimulatory ligand,” as used herein, means a ligand that when present on an antigen presenting cell (e.g., an aAPC, a dendritic cell, a B-cell, and the like) can specifically bind with a cognate binding partner (referred to herein as a "stimulatory molecule") on a T cell, thereby mediating a primary response by the T cell, including, but not limited to, activation, initiation of an immune response, proliferation, and the like.
- an antigen presenting cell e.g., an aAPC, a dendritic cell, a B-cell, and the like
- a cognate binding partner referred to herein as a "stimulatory molecule”
- Stimulatory ligands are well-known in the art and encompass, inter alia, an MHC Class I molecule loaded with a peptide, an anti-CD3 antibody, a superagonist anti-CD28 antibody, and a superagonist anti-CD2 antibody.
- ranges throughout this disclosure, various aspects of the invention can be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 2.7, 3, 4, 5, 5.3, and 6. This applies regardless of the breadth of the range.
- CAAR Chimeric AutoAntibody Receptor
- the present invention is partly based on the discovery that chimeric autoantibody receptors can be used to target autoantibodies that cause autoimmune disease.
- the invention includes compositions comprising at least one chimeric autoantibody receptor (CAAR) specific for an autoantibody, vectors comprising the same, compositions comprising CAAR vectors packaged in viral particles, and recombinant T cells or other effector cells comprising the CAAR.
- CAAR chimeric autoantibody receptor
- the invention also includes methods of making a genetically modified T cell expressing a CAAR (CAART) wherein the expressed CAAR comprises a desmoglein extracellular domain.
- the antigens for many of autoantibody-mediated diseases have been described.
- the present invention includes a technology for treating autoantibody-mediated diseases.
- technologies that target B cells that ultimately produce the autoantibodies and display the autoantibodies on their cell surfaces mark these B cells as disease-specific targets for therapeutic intervention.
- the invention therefore includes a method for efficiently targeting and killing the pathogenic B cells in autoimmune diseases by targeting the disease-causing B cells using an antigen-specific (e.g., desmoglein 3) chimeric autoantibody receptor (or CAAR).
- an antigen-specific e.g., desmoglein 3
- CAAR chimeric autoantibody receptor
- the present invention encompasses a recombinant DNA construct comprising nucleic acid sequences that encode an extracellular domain comprising an autoantigen or a fragment thereof, in one aspect, a human Dsgl, Dsg3 or a fragment thereof, wherein the sequence of the autoantigen or fragment thereof is operably linked to a nucleic acid sequence of an intracellular signaling domain.
- the intracellular signaling domain or otherwise the cytoplasmic domain comprises, a costimulatory signaling region.
- the costimulatory signaling region refers to a portion of the CAAR comprising the intracellular domain of a costimulatory molecule. Costimulatory molecules are cell surface molecules that are required for an efficient T cell activation.
- the invention includes an isolated nucleic acid sequence encoding a chimeric autoantibody receptor (CAAR), wherein the isolated nucleic acid sequence comprises an extracellular domain comprising an autoantigen or fragment thereof, a nucleic acid sequence of a transmembrane domain, and a nucleic acid sequence of an intracellular signaling domain.
- CAAR chimeric autoantibody receptor
- a genetically enginereed chimeric autoantibody receptor includes the major pemphigus vulgaris autoantigen, desmoglein 3 (Dsg3) or fragments thereof, on the cell surface of T cells.
- the CAAR comprises a propeptide, such as a human desmoglein 3 propeptide (amino acids 24-49 of human desmoglein 3): ELRIETKGQYDEEEMTMQQAKRRQKR (SEQ ID NO:2).
- the human Dsg3 propeptide prevents adhesion of the Dsg3 protein to itself within the synthetic pathway of the cell and is cleaved off by furin or furin-like peptidases in the late Golgi.
- the isolated nucleic acid sequence encoding the CAAR comprises a nucleic acid sequence of a propeptide of Dsg3.
- the propeptide of Dsg3 encodes an amino acid sequence comprising SEQ ID NO:2.
- the CAAR comprises a propeptide of Dsg3.
- the CAAR comprises a propeptide of Dsg3 comprising SEQ ID NO:2, such as:
- the nucleic acid sequence of the Dsg3 extracellular domain encodes an amino acid sequence selected from the group consisting of SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO: 10, SEQ ID NO: 11, and SEQ ID NO: 12.
- the CAAR comprises the Dsg3 extracellular domain comprising an amino acid sequence selected from the group consisting of SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO: 10, SEQ ID NO: 11, and SEQ ID NO: 12.
- a nucleic acid sequence has at least 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity or homology to any nucleic acid sequence described herein.
- an amino acid sequence has at least 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% identity or homology to any amino acid sequence described herein.
- constructs described herein comprise an extracellular domain comprising an autoantigen or fragment thereof.
- the autoantigen is selected from the group consisting of Dsgl, Dsg3, and a fragment thereof.
- the CAAR of the invention comprises an autoantibody binding domain otherwise referred to as an autoantigen or a fragment thereof.
- an autoantigen for use in the present invention depends upon the type of autoantibody being targeted.
- the autoantigen may be chosen because it recognizes an autoantibody on a target cell, such as a B cell, associated with a particular disease state, e.g. an autoimmune disease.
- the autoantibody binding domain is derived from the same species in which the CAAR will ultimately be used.
- the autoantibody binding domain of the CAAR comprises an autoantigen that binds an autoantibody or a fragment thereof.
- the autoantibody binding domain portion comprises an epitope of the autoantigen that binds the autoantibody. The epitope is the part of the autoantigen that is specifically recognized by the autoantibody.
- the CAAR comprises a transmembrane domain, such as, but not limited to, a human T cell surface glycoprotein CD8 alpha chain hinge and/or transmembrane domain (amino acids 136-203 of the human human T cell surface glycoprotein CD8 alpha chain).
- a transmembrane domain such as, but not limited to, a human T cell surface glycoprotein CD8 alpha chain hinge and/or transmembrane domain (amino acids 136-203 of the human human T cell surface glycoprotein CD8 alpha chain).
- KPTTTPAPRPPTPAPTIASQPLSLRPEACRPAAGGAVHTRGLDFACDIYIWAPL AGTCGVLLLSLVIT SEQ ID NO: 13
- the human CD8 chain hinge and/or transmembrane domain provides cell surface presentation of the chimeric autoantibody receptor.
- the CAAR comprises a transmembrane domain that is fused to the extracellular domain of the CAAR.
- the CAAR comprises a transmembrane domain that naturally is associated with one of the domains in the CAAR.
- the transmembrane domain is be selected or modified by amino acid substitution to avoid binding to the transmembrane domains of the same or different surface membrane proteins in order to minimize interactions with other members of the receptor complex.
- the transmembrane domain may be derived either from a natural or from a synthetic source. When the source is natural, the domain may be derived from any membrane-bound or transmembrane protein. In one embodiment, the transmembrane domain may be synthetic, in which case it will comprise predominantly hydrophobic residues such as leucine and valine. In one aspect a triplet of phenylalanine, tryptophan and valine will be found at each end of a synthetic transmembrane domain.
- a short oligo- or polypeptide linker between 2 and 10 amino acids in length may form the linkage between the transmembrane domain and the cytoplasmic signaling domain of the CAAR.
- a glycine-serine doublet provides a particularly suitable linker.
- human hinges can be employed as well including the human Ig (immunoglobulin) hinge.
- hinge and/or transmembrane domain examples include, but are not limited to, a hinge and/or transmembrane domain of an alpha, beta or zeta chain of a T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137, CD154, KIR, OX40, CD2, CD27, LFA-1 (CD11a, CD18), ICOS (CD278), 4-1BB (CD137), GITR, CD40, BAFFR, HVEM (LIGHTR), SLAMF7, NKp80 (KLRF1), CD160, CD19, IL2R beta, IL2R gamma, IL7R ⁇ , ITGA1, VLA1, CD49a, ITGA4, IA4, CD49D, ITGA6, VLA-6, CD49f, ITGAD, CD11d, ITGAE, CD103, ITG
- nucleic acid sequence of the transmembrane domain encodes a CD8 alpha chain hinge and/or transmembrane domain. In another embodiment, the nucleic acid sequence of the CD8 alpha chain hinge and/or transmembrane domain encodes an amino acid sequence comprising SEQ ID NO: 13.
- the transmembrane domain comprises a CD8 alpha chain hinge and/or transmembrane domain.
- the cytoplasmic domain or otherwise the intracellular signaling domain of the CAAR of the invention is responsible for activation of at least one of the normal effector functions of the immune cell in which the CAAR has been placed in.
- effector function refers to a specialized function of a cell.
- Effector function of a T cell may be cytolytic activity or helper activity including the secretion of cytokines.
- intracellular signaling domain refers to the portion of a protein which transduces the effector function signal and directs the cell to perform a specialized function. While the entire intracellular signaling domain can be employed, in many cases it is not necessary to use the entire domain. To the extent that a truncated portion of the intracellular signaling domain is used, such truncated portion may be used in place of the intact domain as long as it transduces the effector function signal.
- intracellular signaling domain is thus meant to include any truncated portion of the intracellular domain sufficient to transduce the effector function signal.
- intracellular signaling domains for use in the CAAR of the invention include, but are not limited to, the cytoplasmic portion of the T cell receptor (TCR) and co-receptors that act in concert to initiate signal transduction following antigen receptor engagement, as well as any derivative or variant of these elements and any synthetic sequence that has the same functional capability.
- TCR T cell receptor
- T cell activation can be said to be mediated by two distinct classes of cytoplasmic signaling sequence: those that initiate antigen-dependent primary activation through the TCR (primary cytoplasmic signaling sequences) and those that act in an antigen-independent manner to provide a secondary or co-stimulatory signal (secondary cytoplasmic signaling sequences).
- Primary cytoplasmic signaling sequences regulate primary activation of the TCR complex either in a stimulatory manner or in an inhibitory manner.
- Primary cytoplasmic signaling sequences that act in a stimulatory manner may contain signaling motifs which are known as immunoreceptor tyrosine-based activation motifs or ITAMs.
- intracellular signaling domain includes a fragment or domain from one or more molecules or receptors including, but are not limited to, CD3 zeta, CD3 gamma, CD3 delta, CD3 epsilon, CD86, common FcR gamma, FcR beta (Fc Epsilon Rib), CD79a, CD79b, Fcgamma RIIa, DAP10, DAP12, T cell receptor (TCR), CD27, CD28, 4-1BB (CD137), OX40, CD30, CD40, PD-1, ICOS, lymphocyte function-associated antigen-1 (LFA-1), CD2, CD7, LIGHT, NKG2C, B7-H3, a ligand that specifically binds with CD83, CDS, ICAM-1, GITR, BAFFR, HVEM (LIGHTR), SLAMF7, NKp80 (KLRF1), CD127, CD160, CD19, CD4, CD8alpha, CD8beta, IL2
- the intracellular signaling domain of the CAAR comprises the CD3-zeta signaling domain by itself or in combination with any other desired cytoplasmic domain(s) useful in the context of the CAAR of the invention.
- the intracellular signaling domain of the CAAR can comprise a CD3 zeta chain portion and a costimulatory signaling region.
- the costimulatory signaling region refers to a portion of the CAAR comprising the intracellular domain of a costimulatory molecule.
- a costimulatory molecule is a cell surface molecule other than an antigen receptor or its ligands that is required for an efficient response of lymphocytes to an antigen.
- the intracellular signaling domain encodes a CD137 intracellular domain.
- the CD137 intracellular domain comprisess SEQ ID NO: 15, such as a human T-cell surface glycoprotein CD3 zeta chain isoform 3 intracellular domain (human CD247, amino acids 52-163) RVKFSRSADAPAYQQGQNQLYNELNLGRREEYDVLDKRRGRDPEMGGKPR RKNPQEGLYNELQKDKMAEAYSEIGMKGERRRGKGHDGLYQGLSTATKDT YDALHMQALPPR (SEQ ID NO:16).
- the human intracellular CD3 zeta domain provides stimulatory intracellular signaling upon binding to the extracellular autoantigen, such as Dsgl, Dsg3, or a fragment thereof, without HLA restriction.
- nucleic acid sequence of the intracellular signaling domain comprises a nucleic acid sequence encoding a CD3 zeta signaling domain.
- nucleic acid sequence of the CD3 zeta signaling domain encodes an amino acid sequence comprising SEQ ID NO:16.
- the intracellular signaling domain comprises a CD3 zeta signaling domain.
- the CD3 zeta signaling domain comprises SEQ ID NO:16.
- the CAAR and the nucleic acid encoding the CAAR comprise a human T cell surface glycoprotein CD8 alpha chain signal peptide (amino acids 1-21 of the T-cell surface glycoprotein CD8 alpha chain): MALPVTALLLPLALLLHAARP (SEQ ID NO: 1).
- the human CD8 alpha signal peptide is responsible for the translocation of the receptor to the T cell surface.
- the isolated nucleic acid sequence encoding the CAAR comprises a nucleic acid sequence of a CD8 alpha chain signal peptide.
- the CD8 alpha chain signal peptide encodes an amino acid sequence comprising SEQ ID NO: 1.
- the CAAR comprises a CD8 alpha chain signal peptide.
- the transmembrane domain comprises a CD8 alpha chain hinge and transmembrane domain comprising SEQ ID NO: 13, such as the hinge region mentioned in a) replaced with a peptide linker consisting of the amino acids: SGGGGSGGGGSSG (SEQ ID NO: 14) between the EC domains of desmoglein 3 and the CD8 transmembrane domain.
- the isolated nucleic acid sequence encoding the CAAR comprises a nucleic acid sequence of a peptide linker.
- the nucleic acid sequence of peptide linker encodes an amino acid sequence comprising SEQ ID NO: 14.
- the cytoplasmic signaling sequences within the intracellular signaling domain of the CAAR can be linked to each other in a random or specified order.
- a short oligo- or polypeptide linker for example, between 2 and 10 amino acids in length may form the linkage.
- a glycine-serine doublet is a particularly suitable linker.
- the CAAR comprises a peptide linker.
- the peptide linker comprises SEQ ID NO: 14, such as a human tumor necrosis factor receptor superfamily member 9 (also known as CD137 or 4-1BB ligand receptor) intracellular domain (amino acids 214-255 of the human tumor necrosis factor receptor superfamily member 9): KRGRKKLLYIFKQPFMRPVQTTQEEDGCSCRFPEEEEGGCEL (SEQ ID NO:15).
- the human intracellular CD137 domain provides co-stimulatory intracellular signaling upon binding to the extracellular autoantigen, such as Dsgl, Dsg3, or a fragment thereof, without the need of its original ligand.
- Any domains and/or fragments of the CAAR, vector, and the promoter may be amplified by PCR or any other means known in the art.
- a 3 rd generation self-inactivating lentiviral vector plasmid is useful, in which the expression is regulated under the human elongation factor 1 alpha promoter (e.g., pRRLSIN.cPPT.EF1a.Dsg3CAAR.WPRE).
- human elongation factor 1 alpha promoter e.g., pRRLSIN.cPPT.EF1a.Dsg3CAAR.WPRE.
- the encoding mRNA can be electroporated into the host cell, which would achieve the same therapeutic effect as the virally transduced T cells, but would not be permanent, since the mRNA would dilute out with cell division.
- the invention includes a vector comprising an isolated nucleic acid sequence encoding a chimeric autoantibody receptor (CAAR), wherein the isolated nucleic acid sequence comprises a human nucleic acid sequence of an extracellular domain comprising an autoantigen or fragment thereof, a nucleic acid sequence of a transmembrane domain, and a nucleic acid sequence of an intracellular signaling domain.
- the vector comprises any of the isolated nucleic acid sequences encoding the CAAR as described herein.
- the vector comprises a plasmid vector, viral vector, retrotransposon (e.g. piggyback, sleeping beauty), site directed insertion vector (e.g. CRISPR, zn finger nucleases, TALEN), or suicide expression vector, or other known vector in the art.
- the vector is a viral vector, such as a lentiviral vector.
- the vector is a RNA vector.
- CAAR The production of the CAAR can be verified by sequencing. Expression of the full length CAAR protein may be verified using immunoblot, immunohistochemistry, flow cytometry or other technology well known and available in the art.
- the present invention also provides a vector in which DNA encoding the CAAR of the present invention is inserted.
- Vectors including those derived from retroviruses such as lentivirus, are suitable tools to achieve long-term gene transfer since they allow long-term, stable integration of a transgene and its propagation in daughter cells.
- Lentiviral vectors have the added advantage over vectors derived from onco-retroviruses, such as murine leukemia viruses, in that they can transduce non-proliferating cells, such as hepatocytes. They also have the added advantage of resulting in low immunogenicity in the subject into which they are introduced.
- the expression of natural or synthetic nucleic acids encoding CAARs is typically achieved by operably linking a nucleic acid encoding the CAAR polypeptide or portions thereof to a promoter, and incorporating the construct into an expression vector.
- the vector is one generally capable of replication in a mammalian cell, and/or also capable of integration into the cellular genome of the mammal.
- Typical vectors contain transcription and translation terminators, initiation sequences, and promoters useful for regulation of the expression of the desired nucleic acid sequence.
- the nucleic acid can be cloned into any number of different types of vectors.
- the nucleic acid can be cloned into a vector including, but not limited to a plasmid, a phagemid, a phage derivative, an animal virus, and a cosmid.
- Vectors of particular interest include expression vectors, replication vectors, probe generation vectors, and sequencing vectors.
- the expression vector may be provided to a cell in the form of a viral vector.
- Viral vector technology is well known in the art and is described, for example, in Sambrook et al., 2012, MOLECULAR CLONING: A LABORATORY MANUAL, volumes 1 -4, Cold Spring Harbor Press, NY ), and in other virology and molecular biology manuals.
- Viruses, which are useful as vectors include, but are not limited to, retroviruses, adenoviruses, adeno- associated viruses, herpes viruses, and lentiviruses.
- a suitable vector contains an origin of replication functional in at least one organism, a promoter sequence, convenient restriction endonuclease sites, and one or more selectable markers, (e.g., WO 01/96584 ; WO 01/29058 ; and U.S. Pat. No. 6,326,193 ).
- promoter elements e.g., enhancers
- promoters regulate the frequency of transcriptional initiation.
- these are located in the region 30-110 bp upstream of the start site, although a number of promoters have recently been shown to contain functional elements downstream of the start site as well.
- the spacing between promoter elements frequently is flexible, so that promoter function is preserved when elements are inverted or moved relative to one another.
- tk thymidine kinase
- the spacing between promoter elements can be increased to 50 bp apart before activity begins to decline.
- individual elements can function either cooperatively or independently to activate transcription.
- CMV immediate early cytomegalovirus
- This promoter sequence is a strong constitutive promoter sequence capable of driving high levels of expression of any polynucleotide sequence operatively linked thereto.
- other constitutive promoter sequences may also be used, including, but not limited to the simian virus 40 (SV40) early promoter, mouse mammary tumor virus (MMTV), human immunodeficiency virus (HIV) long terminal repeat (LTR) promoter, MoMuLV promoter, an avian leukemia virus promoter, an Epstein-Barr virus immediate early promoter, a Rous sarcoma virus promoter, the elongation factor-la promoter, as well as human gene promoters such as, but not limited to, the actin promoter, the myosin promoter, the hemoglobin promoter, and the creatine kinase promoter.
- SV40 simian virus 40
- MMTV mouse mammary tumor virus
- HSV human immunodeficiency virus
- inducible promoters are also contemplated as part of the invention.
- the use of an inducible promoter provides a molecular switch capable of turning on expression of the polynucleotide sequence which it is operatively linked when such expression is desired, or turning off the expression when expression is not desired.
- inducible promoters include, but are not limited to a metallothionine promoter, a glucocorticoid promoter, a progesterone promoter, and a tetracycline promoter.
- the expression vector to be introduced into a cell can also contain either a selectable marker gene or a reporter gene or both to facilitate identification and selection of expressing cells from the population of cells sought to be transfected or infected through viral vectors.
- the selectable marker may be carried on a separate piece of DNA and used in a co- transfection procedure. Both selectable markers and reporter genes may be flanked with appropriate regulatory sequences to enable expression in the host cells.
- Useful selectable markers include, for example, antibiotic-resistance genes, such as neo and the like.
- Reporter genes are used for identifying potentially transfected cells and for evaluating the functionality of regulatory sequences.
- a reporter gene is a gene that is not present in or expressed by the recipient organism or tissue and that encodes a polypeptide whose expression is manifested by some easily detectable property, e.g., enzymatic activity. Expression of the reporter gene is assessed at a suitable time after the DNA has been introduced into the recipient cells.
- Suitable reporter genes may include genes encoding luciferase, beta-galactosidase, chloramphenicol acetyl transferase, secreted alkaline phosphatase, or the green fluorescent protein gene (e.g., Ui-Tei et al., 2000 FEBS Letters 479: 79-82 ).
- Suitable expression systems are well known and may be prepared using known techniques or obtained commercially.
- the construct with the minimal 5' flanking region showing the highest level of expression of reporter gene is identified as the promoter.
- Such promoter regions may be linked to a reporter gene and used to evaluate agents for the ability to modulate promoter- driven transcription.
- the vector can be readily introduced into a host cell, e.g., mammalian, bacterial, yeast, or insect cell by any method in the art.
- the expression vector can be transferred into a host cell by physical, chemical, or biological means.
- Physical methods for introducing a polynucleotide into a host cell include calcium phosphate precipitation, lipofection, particle bombardment, microinjection, electroporation, and the like.
- Methods for producing cells comprising vectors and/or exogenous nucleic acids are well-known in the art. See, for example, Sambrook et al., 2012, MOLECULAR CLONING: A LABORATORY MANUAL, volumes 1 -4, Cold Spring Harbor Press, NY ).
- RNA vectors include vectors having a RNA promoter and/ other relevant domains for production of a RNA transcript.
- Viral vectors, and especially retroviral vectors have become the most widely used method for inserting genes into mammalian, e.g., human cells.
- Other viral vectors may be derived from lentivirus, poxviruses, herpes simplex virus, adenoviruses and adeno-associated viruses, and the like. See, for example, U.S. Pat. Nos. 5,350,674 and 5,585,362 .
- Chemical means for introducing a polynucleotide into a host cell include colloidal dispersion systems, such as macromolecule complexes, nanocapsules, microspheres, beads, and lipid-based systems including oil-in-water emulsions, micelles, mixed micelles, and liposomes.
- colloidal dispersion systems such as macromolecule complexes, nanocapsules, microspheres, beads, and lipid-based systems including oil-in-water emulsions, micelles, mixed micelles, and liposomes.
- An exemplary colloidal system for use as a delivery vehicle in vitro and in vivo is a liposome (e.g., an artificial membrane vesicle).
- an exemplary delivery vehicle is a liposome.
- lipid formulations is contemplated for the introduction of the nucleic acids into a host cell (in vitro, ex vivo or in vivo).
- the nucleic acid may be associated with a lipid.
- the nucleic acid associated with a lipid may be encapsulated in the aqueous interior of a liposome, interspersed within the lipid bilayer of a liposome, attached to a liposome via a linking molecule that is associated with both the liposome and the oligonucleotide, entrapped in a liposome, complexed with a liposome, dispersed in a solution containing a lipid, mixed with a lipid, combined with a lipid, contained as a suspension in a lipid, contained or complexed with a micelle, or otherwise associated with a lipid.
- Lipid, lipid/DNA or lipid/expression vector associated compositions are not limited to any particular structure in solution.
- Lipids are fatty substances which may be naturally occurring or synthetic lipids.
- lipids include the fatty droplets that naturally occur in the cytoplasm as well as the class of compounds which contain long-chain aliphatic hydrocarbons and their derivatives, such as fatty acids, alcohols, amines, amino alcohols, and aldehydes.
- Lipids suitable for use can be obtained from commercial sources.
- DMPC dimyristyl phosphatidylcholine
- DCP dicetyl phosphate
- Choi cholesterol
- DMPG dimyristyl phosphatidylglycerol
- Stock solutions of lipids in chloroform or chloroform/methanol can be stored at about -20°C. Chloroform is used as the only solvent since it is more readily evaporated than methanol.
- Liposome is a generic term encompassing a variety of single and multilamellar lipid vehicles formed by the generation of enclosed lipid bilayers or aggregates. Liposomes can be characterized as having vesicular structures with a phospholipid bilayer membrane and an inner aqueous medium. Multilamellar liposomes have multiple lipid layers separated by aqueous medium. They form spontaneously when phospholipids are suspended in an excess of aqueous solution. The lipid components undergo self-rearrangement before the formation of closed structures and entrap water and dissolved solutes between the lipid bilayers ( Ghosh et al., 1991 Glycobiology 5: 505-10 ).
- compositions that have different structures in solution than the normal vesicular structure are also encompassed.
- the lipids may assume a micellar structure or merely exist as nonuniform aggregates of lipid molecules.
- lipofectamine-nucleic acid complexes are also contemplated.
- the invention includes a genetically modified cell, such as a helper T cell, a cytotoxic T cell, a memory T cell, regulatory T cell, gamma delta T cell, a natural killer cell, cytokine induced killer cell, a cell line thereof, and other effector cell, comprises a chimeric autoantibody receptor (CAAR), wherein the CAAR comprises an extracellular domain comprising an autoantigen or fragment thereof, a transmembrane domain, and an intracellular signaling domain.
- the genetically modified cell comprises the CAAR described herein.
- the cell expresses the CAAR.
- the cell has high affinity for autoantibodies expressed on B cells.
- the cell can induce killing of B cells expressing the autoantibodies.
- the cell has low affinity for antibodies bound to a Fc receptor.
- the genetically modified cell is a T cell.
- the T cell expresses a Dsg3 CAAR.
- the autoantigen comprises Dsg3 or a fragment thereof and the T cell has high affinity for Dsg3 autoantibodies expressed on B cells.
- the T cell can induce killing of B cells expressing Dsg3 autoantibodies.
- the autoantigen comprises Dsg3 and the T cell has low affinity for Dsg3 antibodies bound to a Fc receptor.
- the T cell it is also useful for the T cell to have limited toxicity toward healthy cells and specificity to cells expressing autoantibodies. Such specificity prevents or reduces off-target toxicity that is prevalent in current therapies that are not specific for autoantibodies. In one embodiment the T cell has limited toxicity toward healthy cells.
- the invention includes T cells, such as primary cells, expanded T cells derived from primary T cells, T cells derived from stem cells differentiated in vitro, T cell lines such as Jurkat cells, other sources of T cells, combinations thereof, and other effector cells.
- T cells such as primary cells, expanded T cells derived from primary T cells, T cells derived from stem cells differentiated in vitro, T cell lines such as Jurkat cells, other sources of T cells, combinations thereof, and other effector cells.
- a transduced Jurkat cell line with a NFAT response element followed by GFP can be used to detect and isolate Dsg3 specific B cells and to clone the Dsg3 specific antibody repertoire in a comprehensive and unbiased fashion.
- the interacting B and Jurkat cells can be detected as GFP positive doublets and sorted by flow cytometry.
- CAARs The functional ability of CAARs to bind to autoantibodies and sera, for example, but not limited to, pemphigus vulgaris sera, has been assessed in a Jurkat reporter cell line, which depends on activation of the CAAR by binding to autoantibody (in response to which the activated cells fluoresce green due to an NFAT-GFP reporter construct contained therein). Such methods are useful and reliable qualitative measures for functional binding ability.
- the proper processing of the autoantigen on the cell surface is also important and can be measured using monoclonal antibodies.
- a serial dilution of anti-Dsg3 hybridoma cells showed a dose dependent response of the transduced Jurkat cells to the Dsg3 autoantibody displaying hybridoma and no activation by non-Dsg3 specific or healthy primary human B cells.
- primary T cells transduced with the CAAR demonstrate specific killing of AK23.
- truncations of Dsg3 based on major disease epitopes are also useful and included herein. Truncated versions using a smaller hinge region are also useful.
- preventing or reducing possible hemophilic and heterophilic interactions and activation e.g. Dsg3-Dsg3 between the transduced cells or toward keratinocytes is preferred.
- Constructs can be transiently transfected into human cells, such as 293T/17.
- the surface expression can be detected with monoclonal antibodies (either IgG or ScFv) specific for the abovementioned extracellular domains 1,2,3,4,5, the linker between the domains, or other structure included in the CAAR. Binding can be verfied with specific secondary antibodies and quantified by flow cytometry.
- CAAR constructs are compatible with VSV-G pseudotyped HIV-1 derived lentiviral particles and can be permanently expressed in primary human T cells from healthy donors using lentiviral transduction. Killing efficacy can be determined in a chromium based cell lysis assay or any similar assay known in the art.
- Additional target cell lines can be produced as needed by expression of human monoclonal antibodies on the surface of K562 cells.
- a similar approach as above could be applied to desmoglein 1, against which antibodies are found in mucocutaneous forms of pemphigus vulgaris or pemphigus foliaceus.
- a similar approach can also be applied to the NC16A domain of BP180 (Type XVII collagen), which is the primary antigenic target of autoantibodies in bullous pemphigoid; the NCl and NC2 domains of type VII collagen, which is targeted by autoantibodies in epidermolysis bullosa acquisita; or tissue tranglutaminase/gliadin peptide/epidermal transglutaminase, which are targeted by autoantibody complexes in celiac disease and dermatitis herpetiformis.
- the present invention also provides methods for preventing, treating and/or managing a disorder associated with autoantibody-expressing cells (e.g., an autoimmune disease).
- the methods comprise administering to a subject in need thereof a CAART cell of the invention that binds to the autoantibody-expressing cell.
- the subject is a human.
- disorders associated with autoantibody-expressing cells include autoimmune disorders (such as pemphigus vulgaris, paraneoplastic pemphigus or pemphigus foliaceus).
- the present invention also provides methods for preventing, treating and/or managing an autoimmune disease associated with autoantibody-expressing cells.
- the methods comprise administering to a subject in need a CAART cell of the invention that binds to the autoantibody-expressing cell.
- the subject undergoes plasmapheresis or another clinical treatment to remove or decrease antibodies in the subject's serum.
- the method to remove or decrease serum antibodies, such as autoantibodies may include chemical or other methods known in the art.
- the treatment method may be specific to the autoantibody or generalized for any antibody.
- the subject is a human.
- Non-limiting examples of diseases associated with autoantibody-expressing cells include desmoglein 3 autoantibodies, and the like.
- T cells isolated from a subject can be modified to express the appropriate CAAR, expanded ex vivo and then reinfused into the subject.
- the modified T cells recognize target cells, such as Dsg3 specific B cells, and become activated, resulting in killing of the autoimmune target cells.
- Relapse may also occur in patients with an autoimmune disease, for example in pemphigus patients.
- the relapse may be mediated by persistence of the same autoantibody B cell clones, whereas remission is associated with disappearance of these clones.
- the autoimmune cells are depleted to induce long-term remission, possibly due to the longevity of the CAART cells and/or autoantigen-reactive clones do not re-appear (i.e. in pemphigus vulgaris, paraneoplastic pemphigus or pemphigus foliaceus, the break in tolerance is a one-time mistake).
- CAAR cells can further express a detectable marker.
- the detectable marker is activated and expressed, which can be detected by assays known in the art, such as flow cytometry.
- the Dsg3-CAAR includes a NFAT response element and a detectable marker, such as a green fluorescent protein (GFP), to detect and quantify Dsg3 CAAR expressing cells.
- GFP green fluorescent protein
- T cells Prior to expansion and genetic modification, T cells are obtained from a subject. Examples of subjects include humans, dogs, cats, mice, rats, and transgenic species thereof. T cells can be obtained from a number of sources, including skin, peripheral blood mononuclear cells, bone marrow, lymph node tissue, cord blood, thymus tissue, tissue from a site of infection, ascites, pleural effusion, spleen tissue, and tumors. In certain embodiments of the present invention, any number of T cell lines available in the art, may be used. In certain embodiments of the present invention, T cells can be obtained from a unit of blood collected from a subject using any number of techniques known to the skilled artisan, such as Ficoll TM separation.
- cells from the circulating blood of an individual are obtained by apheresis.
- the apheresis product typically contains lymphocytes, including T cells, monocytes, granulocytes, B cells, other nucleated white blood cells, red blood cells, and platelets.
- the cells collected by apheresis may be washed to remove the plasma fraction and to place the cells in an appropriate buffer or media for subsequent processing steps.
- the cells are washed with phosphate buffered saline (PBS).
- PBS phosphate buffered saline
- the wash solution lacks calcium and may lack magnesium or may lack many if not all divalent cations. Again, surprisingly, initial activation steps in the absence of calcium lead to magnified activation.
- a washing step may be accomplished by methods known to those in the art, such as by using a semi-automated "flow-through” centrifuge (for example, the Cobe 2991 cell processor, the Baxter CytoMate, or the Haemonetics Cell Saver 5) according to the manufacturer's instructions.
- a semi-automated "flow-through” centrifuge for example, the Cobe 2991 cell processor, the Baxter CytoMate, or the Haemonetics Cell Saver 5
- the cells may be resuspended in a variety of biocompatible buffers, such as, for example, Ca-free, Mg-free PBS, PlasmaLyte A, or other saline solution with or without buffer.
- the undesirable components of the apheresis sample may be removed and the cells directly resuspended in culture media.
- T cells are isolated from peripheral blood lymphocytes by lysing the red blood cells and depleting the monocytes, for example, by centrifugation through a PERCOLL TM gradient or by counterflow centrifugal elutriation.
- a specific subpopulation of T cells such as CD3 + , CD28 + , CD4 + , CD8 + , CD45RA + , and CD45RO + T cells, can be further isolated by positive or negative selection techniques.
- T cells are isolated by incubation with anti-CD3/anti-CD28 (i.e., 3x28)-conjugated beads, such as DYNABEADS ® M-450 CD3/CD28 T, for a time period sufficient for positive selection of the desired T cells.
- the time period is about 30 minutes.
- the time period ranges from 30 minutes to 36 hours or longer and all integer values there between.
- the time period is at least 1, 2, 3, 4, 5, or 6 hours.
- the time period is 10 to 24 hours.
- the incubation time period is 24 hours.
- TIL tumor infiltrating lymphocytes
- subpopulations of T cells can be preferentially selected for or against at culture initiation or at other desired time points.
- multiple rounds of selection can also be used in the context of this invention. In certain embodiments, it may be desirable to perform the selection procedure and use the "unselected" cells in the activation and expansion process. "Unselected" cells can also be subjected to further rounds of selection.
- Enrichment of a T cell population by negative selection can be accomplished with a combination of antibodies directed to surface markers unique to the negatively selected cells.
- One method is cell sorting and/or selection via negative magnetic immunoadherence or flow cytometry that uses a cocktail of monoclonal antibodies directed to cell surface markers present on the cells negatively selected.
- a monoclonal antibody cocktail typically includes antibodies to CD14, CD20, CD11b, CD16, HLA-DR, and CD8.
- T regulatory cells are depleted by anti-C25 conjugated beads or other similar method of selection.
- the concentration of cells and surface e.g., particles such as beads
- a concentration of 2 billion cells/ml is used.
- a concentration of 1 billion cells/ml is used.
- greater than 100 million cells/ml is used.
- a concentration of cells of 10, 15, 20, 25, 30, 35, 40, 45, or 50 million cells/ml is used.
- a concentration of cells from 75, 80, 85, 90, 95, or 100 million cells/ml is used. In further embodiments, concentrations of 125 or 150 million cells/ml can be used.
- concentrations can result in increased cell yield, cell activation, and cell expansion. Further, use of high cell concentrations allows more efficient capture of cells that may weakly express target antigens of interest, such as CD28-negative T cells, or from samples where there are many tumor cells present ( i.e., leukemic blood, tumor tissue, etc .). Such populations of cells may have therapeutic value and would be desirable to obtain. For example, using high concentration of cells allows more efficient selection of CD8 + T cells that normally have weaker CD28 expression.
- the concentration of cells used is 5 X 10 6 /ml. In other embodiments, the concentration used can be from about 1 X 10 5 /ml to 1 X 10 6 /ml, and any integer value in between.
- the cells may be incubated on a rotator for varying lengths of time at varying speeds at either 2-10°C or at room temperature.
- T cells for stimulation can also be frozen after a washing step.
- the freeze and subsequent thaw step provides a more uniform product by removing granulocytes and to some extent monocytes in the cell population.
- the cells may be suspended in a freezing solution.
- one method involves using PBS containing 20% DMSO and 8% human serum albumin, or culture media containing 10% Dextran 40 and 5% Dextrose, 20% Human Serum Albumin and 7.5% DMSO, or 31.25% Plasmalyte-A, 31.25% Dextrose 5%, 0.45% NaCl, 10% Dextran 40 and 5% Dextrose, 20% Human Serum Albumin, and 7.5% DMSO or other suitable cell freezing media containing for example, Hespan and PlasmaLyte A, the cells then are frozen to -80°C at a rate of 1° per minute and stored in the vapor phase of a liquid nitrogen storage tank. Other methods of controlled freezing may be used as well as uncontrolled freezing immediately at -20° C or in liquid nitrogen.
- cryopreserved cells are thawed and washed as described herein and allowed to rest for one hour at room temperature prior to activation using the methods of the present invention.
- a blood sample or an apheresis product is taken from a generally healthy subject.
- a blood sample or an apheresis is taken from a generally healthy subject who is at risk of developing a disease, but who has not yet developed a disease, and the cells of interest are isolated and frozen for later use.
- the T cells may be expanded, frozen, and used at a later time.
- samples are collected from a patient shortly after diagnosis of a particular disease as described herein but prior to any treatments.
- the cells are isolated from a blood sample or an apheresis from a subject prior to any number of relevant treatment modalities, including but not limited to treatment with agents such as natalizumab, efalizumab, antiviral agents, chemotherapy, radiation, immunosuppressive agents, such as cyclosporin, azathioprine, methotrexate, mycophenolate, and FK506, antibodies, or other immunoablative agents such as CAMPATH, anti-CD3 antibodies, cytoxan, fludarabine, cyclosporin, FK506, rapamycin, mycophenolic acid, steroids, FR901228, and irradiation.
- agents such as natalizumab, efalizumab, antiviral agents, chemotherapy, radiation, immunosuppressive agents, such as cyclosporin, azathioprine, methotrexate, mycophenolate, and FK506, antibodies, or other immunoablative agents such as CAMPATH, anti-CD3
- the cells are isolated for a patient and frozen for later use in conjunction with (e.g., before, simultaneously or following) bone marrow or stem cell transplantation, T cell ablative therapy using either chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT), cyclophosphamide, or antibodies such as OKT3 or CAMPATH.
- chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT), cyclophosphamide, or antibodies such as OKT3 or CAMPATH.
- the cells are isolated prior to and can be frozen for later use for treatment following B-cell ablative therapy, e.g., Rituxan.
- T cells are obtained from a patient directly following treatment.
- the quality of T cells obtained may be optimal or improved for their ability to expand ex vivo.
- these cells may be in a preferred state for enhanced engraftment and in vivo expansion.
- mobilization for example, mobilization with GM-CSF
- conditioning regimens can be used to create a condition in a subject wherein repopulation, recirculation, regeneration, and/or expansion of particular cell types is favored, especially during a defined window of time following therapy.
- Illustrative cell types include T cells, B cells, dendritic cells, and other cells of the immune system.
- T cells are activated and expanded generally using methods as described, for example, in U.S. Patents 6,352,694 ; 6,534,055 ; 6,905,680 ; 6,692,964 ; 5,858,358 ; 6,887,466 ; 6,905,681 ; 7,144,575 ; 7,067,318 ; 7,172,869 ; 7,232,566 ; 7,175,843 ; 5,883,223 ; 6,905,874 ; 6,797,514 ; 6,867,041 ; and U.S. Patent Application Publication No. 20060121005 .
- the T cells of the invention are expanded by contact with a surface having attached thereto an agent that stimulates a CD3/TCR complex associated signal and a ligand that stimulates a co-stimulatory molecule on the surface of the T cells.
- T cell populations may be stimulated as described herein, such as by contact with an anti-CD3 antibody, or antigen-binding fragment thereof, or an anti-CD2 antibody immobilized on a surface, or by contact with a protein kinase C activator (e.g ., bryostatin) in conjunction with a calcium ionophore.
- a ligand that binds the accessory molecule is used for co-stimulation of an accessory molecule on the surface of the T cells.
- a population of T cells can be contacted with an anti-CD3 antibody and an anti-CD28 antibody, under conditions appropriate for stimulating proliferation of the T cells.
- an anti-CD3 antibody and an anti-CD28 antibody can be used as can other methods commonly known in the art ( Berg et al., Transplant Proc. 30(8):3975-3977, 1998 ; Haanen et al., J. Exp. Med. 190(9):13191328, 1999 ; Garland et al., J. Immunol Meth. 227(1-2):53-63, 1999 ).
- the primary stimulatory signal and the co-stimulatory signal for the T cell may be provided by different protocols.
- the agents providing each signal may be in solution or coupled to a surface. When coupled to a surface, the agents may be coupled to the same surface ( i.e., in "cis” formation) or to separate surfaces ( i.e., in "trans” formation). Alternatively, one agent may be coupled to a surface and the other agent in solution.
- the agent providing the co-stimulatory signal is bound to a cell surface and the agent providing the primary activation signal is in solution or coupled to a surface. In certain embodiments, both agents can be in solution.
- the agents may be in soluble form, and then cross-linked to a surface, such as a cell expressing Fc receptors or an antibody or other binding agent which will bind to the agents.
- a surface such as a cell expressing Fc receptors or an antibody or other binding agent which will bind to the agents.
- the two agents are immobilized on beads, either on the same bead, i.e., "cis," or to separate beads, i.e., "trans.”
- the agent providing the primary activation signal is an anti-CD3 antibody or an antigen-binding fragment thereof and the agent providing the co-stimulatory signal is an anti-CD28 antibody or antigen-binding fragment thereof; and both agents are co-immobilized to the same bead in equivalent molecular amounts.
- a 1:1 ratio of each antibody bound to the beads for CD4 + T cell expansion and T cell growth is used.
- a ratio of anti CD3:CD28 antibodies bound to the beads is used such that an increase in T cell expansion is observed as compared to the expansion observed using a ratio of 1:1. In one particular embodiment an increase of from about 1 to about 3 fold is observed as compared to the expansion observed using a ratio of 1:1. In one embodiment, the ratio of CD3 :CD28 antibody bound to the beads ranges from 100:1 to 1:100 and all integer values there between. In one aspect of the present invention, more anti-CD28 antibody is bound to the particles than anti-CD3 antibody, i.e., the ratio of CD3:CD28 is less than one. In certain embodiments of the invention, the ratio of anti CD28 antibody to anti CD3 antibody bound to the beads is greater than 2:1.
- a 1:100 CD3:CD28 ratio of antibody bound to beads is used.
- a 1:75 CD3:CD28 ratio of antibody bound to beads is used.
- a 1:50 CD3:CD28 ratio of antibody bound to beads is used.
- a 1:30 CD3:CD28 ratio of antibody bound to beads is used.
- a 1:10 CD3:CD28 ratio of antibody bound to beads is used.
- a 1:3 CD3:CD28 ratio of antibody bound to the beads is used.
- a 3:1 CD3:CD28 ratio of antibody bound to the beads is used.
- Ratios of particles to cells from 1:500 to 500:1 and any integer values in between may be used to stimulate T cells or other target cells.
- the ratio of particles to cells may depend on particle size relative to the target cell. For example, small sized beads could only bind a few cells, while larger beads could bind many.
- the ratio of cells to particles ranges from 1:100 to 100:1 and any integer values in-between and in further embodiments the ratio comprises 1:9 to 9:1 and any integer values in between, can also be used to stimulate T cells.
- the ratio of anti-CD3- and anti-CD28-coupled particles to T cells that result in T cell stimulation can vary as noted above, however certain preferred values include 1:100, 1:50, 1:40, 1:30, 1:20, 1:10, 1:9, 1:8, 1:7, 1:6, 1:5, 1:4, 1:3, 1:2, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, and 15:1 with one preferred ratio being at least 1:1 particles per T cell.
- a ratio of particles to cells of 1:1 or less is used.
- a preferred particle: cell ratio is 1:5.
- the ratio of particles to cells can be varied depending on the day of stimulation.
- the ratio of particles to cells is from 1:1 to 10:1 on the first day and additional particles are added to the cells every day or every other day thereafter for up to 10 days, at final ratios of from 1:1 to 1:10 (based on cell counts on the day of addition).
- the ratio of particles to cells is 1:1 on the first day of stimulation and adjusted to 1:5 on the third and fifth days of stimulation.
- particles are added on a daily or every other day basis to a final ratio of 1:1 on the first day, and 1:5 on the third and fifth days of stimulation.
- the ratio of particles to cells is 2:1 on the first day of stimulation and adjusted to 1:10 on the third and fifth days of stimulation.
- particles are added on a daily or every other day basis to a final ratio of 1:1 on the first day, and 1:10 on the third and fifth days of stimulation.
- ratios will vary depending on particle size and on cell size and type.
- the cells such as T cells
- the cells are combined with agent-coated beads, the beads and the cells are subsequently separated, and then the cells are cultured.
- the agent-coated beads and cells prior to culture, are not separated but are cultured together.
- the beads and cells are first concentrated by application of a force, such as a magnetic force, resulting in increased ligation of cell surface markers, thereby inducing cell stimulation.
- cell surface proteins may be ligated by allowing paramagnetic beads to which anti-CD3 and anti-CD28 are attached (3x28 beads) to contact the T cells.
- the cells for example, 10 4 to 10 9 T cells
- beads for example, DYNABEADS ® M-450 CD3/CD28 T paramagnetic beads at a ratio of 1:1
- a buffer for example PBS (without divalent cations such as, calcium and magnesium).
- the target cell may be very rare in the sample and comprise only 0.01% of the sample or the entire sample ( i.e., 100%) may comprise the target cell of interest.
- any cell number is within the context of the present invention.
- it may be desirable to significantly decrease the volume in which particles and cells are mixed together i.e., increase the concentration of cells), to ensure maximum contact of cells and particles.
- a concentration of about 2 billion cells/ml is used.
- greater than 100 million cells/ml is used.
- a concentration of cells of 10, 15, 20, 25, 30, 35, 40, 45, or 50 million cells/ml is used.
- a concentration of cells from 75, 80, 85, 90, 95, or 100 million cells/ml is used.
- concentrations of 125 or 150 million cells/ml can be used.
- Using high concentrations can result in increased cell yield, cell activation, and cell expansion. Further, use of high cell concentrations allows more efficient capture of cells that may weakly express target antigens of interest, such as CD28-negative T cells. Such populations of cells may have therapeutic value and would be desirable to obtain in certain embodiments. For example, using high concentration of cells allows more efficient selection of CD8+ T cells that normally have weaker CD28 expression.
- the mixture may be cultured for several hours (about 3 hours) to about 14 days or any hourly integer value in between. In another embodiment, the mixture may be cultured for 21 days. In one embodiment of the invention the beads and the T cells are cultured together for about eight days. In another embodiment, the beads and T cells are cultured together for 2-3 days. Several cycles of stimulation may also be desired such that culture time of T cells can be 60 days or more.
- Conditions appropriate for T cell culture include an appropriate media (e.g., Minimal Essential Media or RPMI Media 1640 or, X-vivo 15, (Lonza)) that may contain factors necessary for proliferation and viability, including serum (e.g., fetal bovine or human serum), interleukin-2 (IL-2), insulin, IFN- ⁇ , IL-4, IL-7, GM-CSF, IL-10, IL-12, IL-15, TGF ⁇ , and TNF- ⁇ or any other additives for the growth of cells known to the skilled artisan.
- Other additives for the growth of cells include, but are not limited to, surfactant, plasmanate, and reducing agents such as N-acetyl-cysteine and 2-mercaptoethanol.
- Media can include RPMI 1640, AIM-V, DMEM, MEM, ⁇ -MEM, F-12, X-Vivo 15, and X-Vivo 20, Optimizer, with added amino acids, sodium pyruvate, and vitamins, either serum-free or supplemented with an appropriate amount of serum (or plasma) or a defined set of hormones, and/or an amount of cytokine(s) sufficient for the growth and expansion of T cells.
- Antibiotics e.g., penicillin and streptomycin, are included only in experimental cultures, not in cultures of cells that are to be infused into a subject.
- the target cells are maintained under conditions necessary to support growth, for example, an appropriate temperature (e.g., 37° C) and atmosphere ( e.g., air plus 5% CO 2 ).
- T cells that have been exposed to varied stimulation times may exhibit different characteristics.
- typical blood or apheresed peripheral blood mononuclear cell products have a helper T cell population (T H , CD4 + ) that is greater than the cytotoxic or suppressor T cell population (T C , CD8 + ).
- T H , CD4 + helper T cell population
- T C cytotoxic or suppressor T cell population
- Ex vivo expansion of T cells by stimulating CD3 and CD28 receptors produces a population of T cells that prior to about days 8-9 consists predominately of T H cells, while after about days 8-9, the population of T cells comprises an increasingly greater population of T C cells.
- infusing a subject with a T cell population comprising predominately of T H cells may be advantageous.
- an antigen-specific subset of T C cells has been isolated it may be beneficial to expand this subset to a greater degree.
- CD4 and CD8 markers vary significantly, but in large part, reproducibly during the course of the cell expansion process. Thus, such reproducibility enables the ability to tailor an activated T cell product for specific purposes.
- the invention includes a method for treating an autoimmune disease in a subject.
- the method comprises: administering to the subject an effective amount of a genetically modified T cell comprising an isolated nucleic acid sequence encoding a chimeric autoantibody receptor (CAAR), wherein the isolated nucleic acid sequence comprises a nucleic acid sequence of an extracellular domain comprising an autoantigen or fragment thereof, a nucleic acid sequence of a transmembrane domain, and a nucleic acid sequence of an intracellular signaling domain, thereby treating the autoimmune disease in the subject.
- CAAR chimeric autoantibody receptor
- the autoimmune disease is selected from pemphigus vulgaris paraneoplastic pemphigus, or pemphigus foliaceus.
- the subject is a human.
- the anti-autoantibody immune response elicited by the CAAR-modified T cells may be an active or a passive immune response.
- the modified T cell targets a B cell.
- autoantibody expressing B cells may be susceptible to indirect destruction by CAAR-redirected T cells that have previously reacted against adjacent autoantibody-expressing cells.
- the fully-human CAAR-genetically modified T cells of the invention may be a type of vaccine for ex vivo immunization and/or in vivo therapy in a mammal.
- the mammal is a human.
- cells are isolated from a mammal (e.g., a human) and genetically modified (i.e., transduced or transfected in vitro) with a vector expressing a CAAR disclosed herein.
- the CAAR-modified cell can be administered to a mammalian recipient to provide a therapeutic benefit.
- the mammalian recipient may be a human and the CAAR-modified cell can be autologous with respect to the recipient.
- the cells can be allogeneic, syngeneic or xenogeneic with respect to the recipient.
- ex vivo culture and expansion of T cells comprises: (1) collecting CD34+ hematopoietic stem and progenitor cells from a mammal from peripheral blood harvest or bone marrow explants; and (2) expanding such cells ex vivo.
- other factors such as flt3-L, IL-1, IL-3 and c-kit ligand, can be used for culturing and expansion of the cells.
- the present invention also includes compositions and methods for in vivo immunization to elicit an immune response directed against an antigen in a patient.
- the cells activated and expanded as described herein may be utilized in the treatment and prevention of diseases that arise in individuals who are immunocompromised.
- the CAAR-modified T cells of the invention are used in the treatment of diseases, disorders and conditions associated with expression of autoantibodies.
- the cells of the invention are used in the treatment of patients at risk for developing autoimmune diseases, disorders and conditions associated with expression of autoantibodies.
- the present invention provides methods for the treatment or prevention of autoimmune diseases, disorders and conditions associated with expression of autoantibodies comprising administering to a subject in need thereof, a therapeutically effective amount of the CAAR-modified T cells of the invention.
- CAAR-modified T cells of the present invention may be administered either alone, or as a pharmaceutical composition in combination with diluents and/or with other components such as IL-2 or other cytokines or cell populations.
- pharmaceutical compositions of the present invention may comprise a target cell population as described herein, in combination with one or more pharmaceutically or physiologically acceptable carriers, diluents or excipients.
- compositions may comprise buffers such as neutral buffered saline, phosphate buffered saline and the like; carbohydrates such as glucose, mannose, sucrose or dextrans, mannitol; proteins; polypeptides or amino acids such as glycine; antioxidants; chelating agents such as EDTA or glutathione; adjuvants ( e.g., aluminum hydroxide); and preservatives.
- buffers such as neutral buffered saline, phosphate buffered saline and the like
- carbohydrates such as glucose, mannose, sucrose or dextrans, mannitol
- proteins polypeptides or amino acids such as glycine
- antioxidants such as glycine
- chelating agents such as EDTA or glutathione
- adjuvants e.g., aluminum hydroxide
- preservatives e.g., aluminum hydroxide
- compositions of the present invention may be administered in a manner appropriate to the disease to be treated (or prevented).
- the quantity and frequency of administration will be determined by such factors as the condition of the patient, and the type and severity of the patient's disease, although appropriate dosages may be determined by clinical trials.
- compositions of the present invention can be administered at a dosage of 10 4 to 10 9 cells/kg body weight, in some instances 10 5 to 10 6 cells/kg body weight, including all integer values within those ranges. T cell compositions may also be administered multiple times at these dosages.
- the cells can be administered by using infusion techniques that are commonly known in immunotherapy (see, e.g., Rosenberg et al., New Eng. J. of Med. 319:1676, 1988 ).
- the optimal dosage and treatment regime for a particular patient can readily be determined by one skilled in the art of medicine by monitoring the patient for signs of disease and adjusting the treatment accordingly.
- activated T cells are administered to a subject. Subsequent to administration, blood is redrawn or apheresis is performed, and T cells are activated and expanded therefrom using the methods described here, and are then reinfused back into the patient. This process can be carried out multiple times every few weeks.
- T cells can be activated from blood draws of from 10cc to 400cc. In certain embodiments, T cells are activated from blood draws of 20cc, 30cc, 40cc, 50cc, 60cc, 70cc, 80cc, 90cc, or 100cc. Not to be bound by theory, using this multiple blood draw/multiple reinfusion protocol, may select out certain populations of T cells.
- Administration of the cells of the invention may be carried out using any convenient means, including by aerosol inhalation, injection, ingestion, transfusion, implantation or transplantation.
- the compositions described herein may be administered to a patient transarterially, subcutaneously, intradermally, intratumorally, intranodally, intramedullary, intramuscularly, by intravenous ( i.v .) injection, or intraperitoneally.
- the T cell compositions of the present invention are administered to a patient by intradermal or subcutaneous injection.
- the T cell compositions of the present invention are administered by i.v . injection.
- the compositions of T cells may be injected directly into a tumor, lymph node, or site of infection.
- cells activated and expanded using the methods described herein, or other methods known in the art where T cells are expanded to therapeutic levels are administered to a patient in conjunction with (e.g., before, simultaneously or following) any number of relevant treatment modalities, including but not limited to treatment with agents such as antiviral therapy, cidofovir and interleukin-2, Cytarabine (also known as ARA-C) or natalizumab treatment for MS patients or efalizumab treatment for psoriasis patients or other treatments for PML patients.
- agents such as antiviral therapy, cidofovir and interleukin-2, Cytarabine (also known as ARA-C) or natalizumab treatment for MS patients or efalizumab treatment for psoriasis patients or other treatments for PML patients.
- the T cells of the invention may be used in combination with chemotherapy, radiation, immunosuppressive agents, such as cyclosporin, azathioprine, methotrexate, mycophenolate, and FK506, antibodies, or other immunoablative agents such as CAM PATH, anti-CD3 antibodies or other antibody therapies, cytoxin, fludarabine, cyclosporin, FK506, rapamycin, mycophenolic acid, steroids, FR901228, cytokines, and irradiation.
- immunosuppressive agents such as cyclosporin, azathioprine, methotrexate, mycophenolate, and FK506, antibodies
- other immunoablative agents such as CAM PATH, anti-CD3 antibodies or other antibody therapies
- cytoxin fludarabine
- cyclosporin FK506, rapamycin
- mycophenolic acid steroids
- steroids FR901228
- cytokines cytokines
- irradiation irradiation
- the cell compositions of the present invention are administered to a patient in conjunction with ( e.g., before, simultaneously or following) bone marrow transplantation, T cell ablative therapy using either chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT), cyclophosphamide, or antibodies such as OKT3 or CAMPATH.
- chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT), cyclophosphamide, or antibodies such as OKT3 or CAMPATH.
- the cell compositions of the present invention are administered following B-cell ablative therapy such as agents that react with CD20, e.g., Rituxan.
- B-cell ablative therapy such as agents that react with CD20, e.g., Rituxan.
- subjects may undergo standard treatment with high dose chemotherapy followed by peripheral blood stem cell transplantation.
- subjects receive an infusion of the expanded immune cells of the present invention.
- expanded cells are administered before or following surgery.
- the dosage of the above treatments to be administered to a patient will vary with the precise nature of the condition being treated and the recipient of the treatment.
- the scaling of dosages for human administration can be performed according to art-accepted practices.
- the dose for CAMPATH for example, will generally be in the range 1 to about 100 mg for an adult patient, usually administered daily for a period between 1 and 30 days.
- the preferred daily dose is 1 to 10 mg per day although in some instances larger doses of up to 40 mg per day may be used (described in U.S. Patent No. 6,120,766 ).
- the desmoglein 3 (Dsg3) CAAR was cloned by PCR amplification from human cDNA with specific primers
- the exon-encoding sequence of human Dsg3 was amplified from the plasmid DN653 (a gift from Prof. Amagai, Keio University, Tokyo, Japan) with the primers forward 5'CCAGGCCGGAATTGCGAATAGAGACTAAAGG (SEQ ID NO:25) and reverse 5'CGTGGTGGGCTTCCTCCCTGAGTGCGGCC (SEQ ID NO:26), so that an overlap with the 5' located sequence of the signal peptide of CD8 and the 3' located CD8 hinge became possible.
- the fragments were purified (Promega wizard SV) and subjected to extension overlap PCRs, joining fragment A with B as well as C with D.
- the joined fragment CD was extended with another overlap-extension PCR with fragment E and finally the fragments AB and CDE were PCR-conjugated. All PCR reactions were performed with Q5 hot start polymerase (New England Biolabs) according to the manufacturer's recommendation.
- the final 2.5 kB long PCR product was subjected to a gel purification and digested either with BamHI-SalI (cloning into lentiviral vector plasmid) or XhoI-BamHI (cloning into non-lentiviral expression plasmid, namely pCEP4, life technologies).
- the Dsg3 CAAR was cloned into a 3rd generation HIV1-based lentiviral vector plasmid, namely pRRLSIN.cPPT.PGK-GFP.WPRE (addgene 12252).
- the compatible ends of SalI and XhoI result in a deletion of the XhoI and SalI sites, so that the plasmid retains the unique BamHI and SalI sites flanking the GFP that was replaced with the Dsg3 CAAR by digestion and ligation.
- Shortened versions of the Dsg3 CAAR were cloned into the same plasmid backbone using BamHI and SalI.
- the shortened versions were codon optimized using a codon adaptation index-based algorithm (geneart, life technologies) and synthesized as double-stranded DNA fragments (geneart, life technologies).
- the CD8 hinge region was replaced with an 13 amino acid long flexible GS-linker, providing a unique NheI site that could be used to insert different Dsg3 encoding fragments between the Kozak sequence (with BamHI) and the GS-linker (with NheI).
- the complete extracellular Dsg3 was cloned into this cloning site and from the derived plasmid various versions of Dsg3 were produced with the following primers:
- the EC3.NheI.rev primer was used in combination with a primer for the 5' sequence of the EC2 (5'AAGCGGCGGCAGAAACGCATCCTGGACATCAACGACAACC) (SEQ ID NO:34); the resulting EC2-3 sequence was PCR-conjugated with the CD8 signal peptide (previously amplified with the overlapping reverse primer 5' GATGCGTTTCTGCCGCCGCTTGGCCTGCTGCATTGTC (SEQ ID NO:35) and the BamHI.CD8 forward primer (see above)).
- the sequence of the complete EC1-5 CAAR construct is as follows:
- the desmoglein 1 (Dsgl) CAAR was cloned by PCR amplification from human cDNA using specific primers
- construct encoding sequences in the plasmids were confirmed by digestion with SalI and BamHI. All constructs were verified by Sanger sequencing and the plasmids were purified in larger scale with removal of endotoxins (qiagen endofree maxiprep).
- 293T/17 cells were transiently transfected using Polyethylenimine (PEI, jetPEI, polyplus) at a DNA:PEI ratio of 1:2. Expression was validated by flow cytometry with anti-Dsg3 EC1-IgG1 (clone: Px43) and anti-human Fc-PE (clone HP6017) after 36 hours on a LSRII flow cytometer (BD).
- PEI Polyethylenimine
- VSV-G pseudotyped lentiviral particles were produced using a 3rd generation packaging system. Briefly, 293T/17 cells (ATCC CRL-11268) were transfected at a confluency of 90% with a mixture of the pRRLSIN.cPPT.EF1a-Dsg3CAAR. WPRE plasmid, the envelope plasmid pMD2.G (addgene 12252), the packaging plasmids pRSVRev (addgene 12253) and pMDLgm/pRRE (addgene 12251) in a complex with Lipofectamine2000 (life technologies). Lentivirus containing supernatant was harvested after 24, 48 and 72 hours, filtered through a 0.4 micrometer membrane, concentrated at 12000g for 12 hours at 4°C and stored at -80°C until further usage.
- Jurkat cells were cultured at 37°C with 5%CO2 in a completely humidified environment using RPMI1640, HEPES 10mM, Penicillin/Streptomycin 1% and FBS at 10%. Hybridoma medium was additionally supplemented with 1% non-essential amino acids, 1% sodium pyruvate and 0.5mM BME.
- the CAAR constructs were expressed in a Jurkat reporter cell line that has been selected (G418) for stable expression of GFP controlled under an NFAT response element, facilitating GFP expression after CAAR engagement and PLCgamma and IP3 mediated intracellular calcium release.
- the Jurkat cell line was provided by Arthur Weiss (UCSF).
- Jurkat cells were transduced with CAAR lentivirus at a multiplicity of infection of 5-10 and expression of the CAAR construct was validated after >72 hours with anti-EC5-Dsg3 mouse IgG1 (clone: 5G11) and anti-mouse IgG1-APC (clone: A85-1, BD Pharmingen) by flow cytometry.
- tosylactivated dynabeads life technologies
- serum from a PV patient and a non-PV individual were loaded onto beads.
- the AK23 hybridoma cell line ( US 7550562 B2 ) served as cellular target that secretes anti-Dsg3 antibodies and is surface-positive for these antibodies.
- As negative control we used another hybridoma cell line that secretes antibodies against the human VH3-15 framework region (BK-2; US 5738847 A )
- BK-2 human VH3-15 framework region
- the CAAR Jurkat cells were incubated for 4 hours with either beads at a bead:cell ratio of 3:1 or target cells at increasing concentration at 37°C. GFP expression was validated by flow cytometry.
- human B cells from a non-PV individual and primary human keratinocytes (provided by the SDRC, core B, University of Pennsylvania) were used to test for off-target effects.
- T cells Primary human T cells were cultured in RPMI1640, 10%FBS and 10mM HEPES, supplemented with 1% penicillin/streptomycin. T cells were isolated from voluntary healthy donors and provided by the human immunology core (University of Pennsylvania). Bulk T cells (CD4+ and CD8+) were stimulated with anti-CD3 and anti-CD28 beads (dynabeads, life technologies) at a bead:cell ratio of 3:1. When only CD8 cells were used, the culture medium was supplemented with 150-300 IU/ml IL2. 24 hours after stimulation, 10 6 T cells were transduced with the CAAR constructs or a mock control at a MOI of 5-10.
- Spontaneous release by target cells only was analyzed in the same volume and maximum release was assessed by treating target cells with SDS at a final concentration of 2.5%.
- Fc-receptor mediated lysis K562 cells positive for CD32 were incubated with CAAR T cells in the presence of human monoclonal anti-Dsg3 IgG1 (clone: PV2B7) at a concentration of 5 micrograms/ml or anti-human CD3 (okt3) at the same concentration.
- CAAR or control-CAR transduced T cells were expanded as described herein.
- CAAR or control-CAR T cells were adjusted to a concentration of 3x10 7 cells/ml and mixed with GFP-clickbeetle red or green transduced AK18,19 or 23 hyrbidoma cells (at 10 6 cells/ml), resulting in a T cell to target ratio of 30.
- Cells were kept on ice and 200 ⁇ l of the cell mixture was injected into the tail vein of NSG mice, resulting in 3x10 6 T cells and 10 5 target cells per mouse. After i.v. injection, NSG mice were injected with D-Luciferin monopotassium salt solution at a dose of 300mg/kg body weight.
- mice were sacrificed in accordance to an approved IACUC protocol. Spleen and bone marrow samples were kept in RPMI medium supplemented with 10% FBS until further processing. Blood samples from sacrificed mice were obtained by cardiac puncture and anticoagulated with EDTA. Single cell suspension from spleen and flushed bone marrow samples were obtained by passing cells through a 100um cell strainer.
- PV Pemphigus vulgaris
- Dsg3 autoantigen Dsg3
- anti-desmoglein antibodies are necessary and sufficient to cause characteristic suprabasal blisters in animal and human skin models.
- Autoantibodies are synthesized and secreted by autoreactive B lymphocytes and primarily target the extracellular EC 1-3 domains of Dsg3 where trans- and cis-adhesive residues are located.
- the most effective treatment strategies in PV target B lymphocytes and include systemic corticosteroids, azathrioprine, mycophenolate mofetil, and cyclophosphamide to inhibit lymphocyte proliferation.
- Rituximab is used as an anti-CD20 B cell depletion mechanism via a B lymphocyte specific surface molecule.
- T cells can be engineered to kill target cells independent of MHC and co-stimulatory signals by expressing a recombinant chimeric T cell antigen receptor with an extracellular domain that specifically recognizes the target antigen, and an intracellular domain that is sufficient to activate signaling after antigen binding ( C himeric A ntigen R eceptors, or CARs).
- Chimeric Antigen Receptors consist of customized cell surface receptor (typically an antibody against a specific cell surface molecule on the target cell), transmembrane domain and intracellular domains of costimulatory signaling receptors in the same protein.
- CARs include the ability to be directed against virtually all known antigens, CARs act independently of MHC expression of the target cell, and CAR binding to its target antigen results in activation of the T cell independently of costimulatory signals from the target cell.
- Engineering T cells for PV treatment relies on the perfect target for a genetically engineered T cell that is shared among all target cells, as well as unique to the target cell. For example, autoreactive B cells in PV express a surface Ig that binds to desmoglein 3.
- the design for the genetically engineered T cells for PV optimally includes a typical chimeric antigen receptor (CAR) with a high affinity antibody binding moiety that targets specific autoantibodies.
- CAR chimeric antigen receptor
- B cells pathogenic cells
- FIG. 1 is a schematic drawing that depicts how the proposed chimeric autoantibody receptor (CAAR) is distinct from all previously developed technologies.
- the left half of the figure shows a chimeric antigen receptor (CAR) on an effector cell to(the patient's own T cells), which targets an antigen (CD19) that is specifically expressed on the B cell lymphoma.
- CAR chimeric antigen receptor
- CD19 antigen that is specifically expressed on the B cell lymphoma.
- What makes PV autoreactive B cells unique from all other B cells is that they express an autoantibody on their cell surface that is specific for the disease autoantigen, desmoglein 3 (Dsg3).
- the PV CAAR is the autoantigen (Dsg3), which targets the Dsg3-autoantibody expressed on the surface of autoreactive PV B cells.
- Figure 2 illustrates that the interaction between engineered chimeric T cell receptors and target Dsg3 specific B cells is more specific for PV than CD19- or CD20-targeted therapies. Unlike a CD19- or CD20- targeted therapy, a generalized immune suppression should not occur with a Dsg3 targeted therapy.
- Engineered T cells are more sustainable than monoclonal antibody-based therapy because T cells proliferate in response to antigen and form memory T cells.
- engineered chimeric T cell receptors that target Dsg specific B cells remove both memory and short-lived antibody-secreting B cells ( Figure 3 ).
- Desmogleins are ideal autoantigens for a chimeric autoantibody receptor (CAAR) because they consist of modular extracellular domains that can be truncated. Also, CAAR efficiency is influence by the intermembrane distance between the T cell and its target, see Figure 4 .
- Figures 5-6 illustrate the ability to amplify individual domains of Dsg3 ( Figure 5 ) and CD137 ( Figure 6 ) from cDNA of peripheral blood mononuclear cells.
- Figure 7 further shows amplification of Dsg3 and Dsg3 CAAR from plasmid DN653.
- Dsg3 CAAR protein was analyzed by western blot 48 hours after transformation and cell lysis of 293T cells under reducing conditions ( Figure 8 ).
- Dsg3 E-His baculovirus supernatant was a positive control
- untransfected HEK293T cells were a negative control.
- the expected size was 96 kDa for the unglycosylated protein, which typically migrates at ⁇ 112 kD with glycosylation.
- Dsg3 CAARs To evaluate the cytotoxicitiy of Dsg3 CAARs, the ability of Dsg3 CAAR expressed in primary human T cells to kill target cells expressing anti-Dsg3 surface autoantibodies (test for efficacy) and the potential for Dsg3 CAAR to kill off-target cells that may express a surface Fc receptor, which could bind PV autoantibodies and result in unintended redirected lysis (test for safety) was determined.
- Dsg3 CAAR specificity toward intended and unintended targets was tested in lysis assays. It was anticipated that the Dsg3 CAART cells would kill anti-Dsg3 B cells as an intended target because of a high affinity interaction between the Dsg3 CAAR and anti-Dsg3 autoantibody (left side of Figure 9 ). Whereas weak hemophilic interactions between Dsg3 CAART cells and cells expressing anti-Dsg3 with a Fc receptor (keratinocytes) would not result in killing by the Dsg3 CAART cells (right side of Figure 9 ).
- Dsg3 CAAR Jurkat cells did not show strong redirected lysis.
- NFAT-GFP Jurkats cells expressing Dsg3-CAAR were stimulated with antibody coated beads at a ratio of 3:1 (beads:cells).
- Flow cytometry plots shown in Figure 10 indicated that signaling in Dsg3 CAAR Jurkat cells was present after exposure to PV target antibodies.
- AK23, PV4B3, and PV2B7 are Dsg3-specific mAbs, which if bound to the CAAR Jurkat cells, should trigger signaling that induces GFP expression.
- EFla promoter functioned better than the PGK promoter and resulted in specific signaling.
- SS1 anti-mesothelin CAR was used as a positive control and had baseline positive activity. Non-transduced cells were used as a negative-control and no GFP signal was detected.
- Dsg3 CAAR Jurkat cells Low level, but specific, signaling was induced in Dsg3 CAAR Jurkat cells after exposure to polyclonal pemphigus vulgaris (PV) patient serum IgG (reflecting the low overall percentage of total IgG that is Dsg3-specific) ( Figure 11 ).
- Dsg3 CAAR Jurkat cells also responded to low numbers of surface IgG on cells (AK23 hybridoma) in a dose-dependent manner. Signaling was not induced when Dsg3 CAAR Jurkat cells were exposed to Dsg3 expressing keratinocytes, indicating that interactions of Dsg3 with desmosomal cadherins on keratinocytes should not result in skin or mucous membrane toxicity.
- Dsg3 CAAR effector cells To test safety of Dsg3 CAAR effector cells, different scenarios were proposed for testing cytotoxicity toward target cells that express anti-Dsg3 surface autoantibodies and off-target cells that express surface Fc receptors that could bind serum PV autoantibodies resulting in unintended redirected lysis.
- the cells on the left in Figure 14 show expected killing of anti-Dsg3 B cells as the intended target.
- the cells on the right in Figure 14 show unintended killing of cells that express Fc receptors, potentially through redirected lysis.
- Dsg3 CAAR effector cells were exposed to a K562 cell line that expressed surface Fc receptors pre-loaded with PV anti-Dsg3 mAb (PV2B7). No redirected lysis was observed with PV mAb bound to Fc receptor (left graph in Figure 15 ), as it behaved similar to the negative controls and non-transduced cells (right graph in Figure 15 ).
- TCR activation (and hence killing) is dependent on the distance between effector and target cell (ideal distance is 14-15 nm). Shorter or longer distances will result in loss of TCR activation.
- the target (surface IgG) for the Dsg3 CAAR is ⁇ 8.4nm.
- Desmoglein 3 is roughly 12.5-18nm long. The desmosomal gap is ⁇ 40nm. Desmoglein 3 consists of 5 Ig-like domains with a size of approximately 3.5nm each. Trans- and cis- interactions are approximately 24.5nm when interacting through EC2 cis-interaction.
- FIG. 16A is an image of an electrophoretic gel showing amplification of the different Dsg3 extracellular domains, EC2-3, EC1-2, EC1-3, EC1-4 and EC1-5 ( Figure 16B ), which were constructed to optimize Dsg3 CAAR cytotoxicity, since the efficacy of CAAR-mediated cytotoxicity is dependent on the distance between effector and target cell.
- Dsg EC1-3, EC1-4, EC1-5 CAARs were expressed in primary human T cells and recognized by 3 different PV anti-Dsg3 mAbs, AK23, Px44, and F779 ( Figure 17 ). EC1-2 did not effectively express.
- the efficacy of the Dsg3 CAAR against an anti-Dsg3 IgG mouse hybridoma is shown in Figure 18 .
- the Dsg3 CAAR was expressed on the surface of primary human T cells and specific in vitro killing of AK23 (an anti-Dsg3 hybridoma) was observed in a chromium release assay after 4 hours as compared to the negative control, BK2.
- Dsg3 CAAR T cells were further shown to specifically kill AK23 hyridoma in a chromium-51 release assay.
- Dsg3 CAAR killing of AK23 hybridoma increased over time in a chromium release assay after 24 hours ( Figure 19 ). Essentially, about 100% killing was observed with the Dsg3 EC1-3 and EC1-4 CAAR after 16 hours.
- the killing efficacy of the CAARs correlated with CAAR size (shorter was better EC1-3>EC1-4>EC1-5).
- Human CD19 was not expressed on the target hybridoma cell as anti-human CD19 CAR was the mock control.
- Control hybridoma (BK2) which does not express a Dsg3-autoantibody, demonstrated some killing by Dsg3 CAAR cells over 24 hours, perhaps due to human-mouse alloreactivity.
- Dsg3 CAART cells killed anti-Dsg3 cells targeting a broad range of epitopes, F779 (anti-EC1) and PVB28 (anti-EC2).
- Dsg3 EC1-4 CAAR (EC1-4bbz) killed anti-EC1, anti-EC2 and anti-EC3 B cells, see Figure 20 .
- Dsg3 EC1-4 CAAR also did not kill K562 wild type (wt) cells ( Figure 21 ), as well as non-transduced T cells did not kill F779/PVB28 K562 cells.
- the K562 cells expressing F779 or PVB28 surface immunoglobulins also expressed CD19 and mesothelin.
- Nontransduced (NTD) T cells were used as a negative control.
- Dsg3 CAART cells were further tested to determine if antibody affinities affect efficacy.
- the three antibodies have varying affinities and Dsg3 CAART cells are effective against all three.
- Dsg3 CAART cells demonstrated specific killing even in the presence of increasing concentrations of soluble antibody ( Figure 24 ).
- the killing assays were performed in the presence of the hybridoma and soluble antibody from the same clone.
- Figure 24 demonstrates that Dsg3 CAART cells targeted cells even in the presence of soluble blocking anti-Dsg3 antibody for all conditions tested.
- Dsg3 bearing T cells were tested in a reversed antibody-dependent cellular toxicity (rADCC) assay to determine if Dsg3 CAART cells targeted Fc receptor expressing cells (upper graph in Figure 25 ).
- FcgRI expressing K562 cells (CD64+ K562) were co-incubated for 8 hours with CAART cells in PV serum.
- Target cells were 100% positive for surface IgG, yet were not killed by Dsg3 CAART cells.
- K562 cells expressing PVB28 IgG4 in normal medium were used as a positive control to show that the same CAART cells were, in fact, functional (lower graph in Figure 25 ), i.e. specifically killed target cells.
- Dsg3 CAAR T cells were incubated with primary human epidermal keratinocytes grown in calcium-containing media to induce desmosome assembly. No killing was observed with the Dsg3 EC1-4 CAART cells ( Figure 26 ). In contrast, CART cells consisting of a mAb against Dsg3 and Dsg1 effectively killed keratinocytes.
- Dsg3 CAAR T cells also effectively controlled IgG secreting hybridoma cells in vivo.
- Figure 27 shows AK19 hybridoma cells and either Dsg3 EC1-4 CAAR T cells or control CAR T cells were co-engrafted into NSG mice. At the indicated time points, tumor burden was quantified by bioluminescence imaging. Bioluminescence >10e8 (total flux[P/s]) was used to declare mice 'dead.'
- AK19 hybridomas were labeled with GFP and click beetle green luciferase prior to in vivo injection, which allowed the determination of whether the AK19 cells remained sIg+.
- Dsg3 CAAR T cells further engrafted and maintained long-term CAAR expression ( Figure 29 ). In fact, significant expansion of the cells was observed as compared to control CAR T cells. Percent of human T cells in mouse bone marrow (BM):control CAR versus Dsg3 CAAR
- Figures 30A-C show the presence of Dsg3 CAAR T cells that engrafted in different immunological compartments, blood ( Figure 30A ), bone marrow ( Figure 30B ), and spleen ( Figure 30C ).
- Dsg3 EC1-3 CAAR further reduced AK23 tumor burden by bioluminescence ( Figure 32A ) and increased survival ( Figure 32B ). Potentially similar to AK19, mice that escape the Dsg3 EC1-3 CAAR may be selected for negative surface immunoglobulin AK23 cells.
- Figures 33-35 further show that Dsg3 EC1-4 CAAR T cells show efficacy against a broad range of targets in vivo, including AK18 (anti-EC3), AK19 (anti-EC2), and AK23 (anti-ECl), as evidenced by decreased bioluminescence in Dsg3 CAART- versus control CART-treated mice and increased survival of Dsg3 CAART-treated mice.
- a Dsg3 CAAR has been developed that shows specific binding, activation by, and killing of cells expressing surface anti-Dsg3 IgG (efficacy).
- the Dsg3 CAAR does not activate in response to keratinocytes expressing Dsg3, or cells expressing Fc receptors that may bind serum anti-Dsg3 IgG (safety).
- the Dsg3 CAAR is a novel and specific strategy to target only the autoreactive B cells in PV and could be used as a proof of principle for the therapeutic use of CAARs in other autoantibody-mediated diseases.
- CAAR construct including Dsg1 was generated ( Figure 36 ). Based on results optimizating the Dsg3 CAAR, a Dsg1 CAAR was constructed consisting of EC 1-5 domains of Dsg1 for the CAAR extracellular domain. K562 cells were engineered to express monoclonal surface IgG with Dsg1 EC1 or Dsg1 EC2 specificities.
- Dsg1 CAAR cells effectively killed anti-EC 1 and anti-EC2 B cells, see Figure 37A , but did not kill wild type K562 cells or K562 cells expressing anti-Dsg3 antibodies ( Figure 37B ).
- a CAAR construct including KIR transmembrane and cytoplasmic domains was generated ( Figure 38 ). Based on results optimizating the Dsg3 CAAR, a Dsg3 KIR CAAR was constructed consisting of EC1-3 or EC 1-4 domains of Dsg3 with KIR transmembrane and cytoplasmic domains. PVB28 cells express anti-Dsg3 antibodies. After 16 hrs in a 51 Chromium release assay, Dsg3 KIRCAAR cells effectively killed anti-EC2 B cells ( Figure 39A ) and not control cells (not expressing anti-Dsg3 antibodies), ( Figure 39B ).
- the invention is further embodied by the following items:
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US11407804B2 (en) | 2022-08-09 |
US20230303653A1 (en) | 2023-09-28 |
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